I like that you asked her to please do something to benefit the family. It sounds like you were polite. Always a good start. But so far she doesn't understand that household chores have a direct effect on everyone else.
Both children should have chores on a regular basis. Those can be age-appropriate but can take the same amount of time (and that's the time it takes a normal person to do them, not the stalling techniques of a reluctant child).
The punishment can be almost anything at this age - you take away what they want. Punishments don't have to be so immediate at this age because they are old enough to make the connection. You also have to consider that there is a different between a punishment and a consequence. So what was she doing while you were gone for 2.5 hours? Homework? Then the consequence should have been doing the dishes when you got back, plus something else. If she was watching TV or texting her friends, then the punishment of no TV is fine. But you still institute the chores and she has to do tomorrow's dishes. If she doesn't, the consequence is that there are no dishes and so you don't prep a meal for her. (And no, she can't order take out - she has to actually make something.) The other consequence is that you can't do what she needs because YOU are washing the dishes upon your return. So there is no time to (fill in the blank…) help with her homework, drive her to the mall, do her laundry so she has her favorite shirt for the next day, pick up X at the store. Whatever her reason was for not doing the dishes ("I forgot" or "I didn't feel like it") is what YOU say to her. You say it in a way that makes it very clear that there's a direct connection - "I know how you feel about the dishes. I didn't feel like doing your laundry." Or you say you didn't have time to do anything else because you were too tired from doing the dishes.
So the consequence is that you don't have time to do X for her. The punishment should be for outright defiance, eye-rolling, disrespect, or repeated refusal to do stuff, etc. Does that make sense?
If she gives you attitude (which a lot of kids this age will do), then you take away electronics - TV, computer, cell phone. She might argue that she needs a computer for homework, so you have to police it, but that means you walk into her room constantly and look over her shoulder at what she is working on. It will drive her crazy. It will make the point.
Separately, you make a list of regular chores. You can either assign them, or you can allow both kids to make some choices about which ones they will be responsible for. That's good family teamwork - everyone chooses how they will help. As long as it doesn't matter to you which ones you do, you can let them pick first. Otherwise you take turns picking, and you post the list. Failure to do a chore means that someone else (you or your husband) can hand off one of your chores to them as well.
I've seen a "chore bucket" on different parenting sites - you have a bucket for stuff you either find on the floor (shoes, gloves, lunch boxes, clean clothes they didn't hang up, whatever) that you have had to confiscate for mis-use (like a cell phone during homework time). In order to get it back, the child has to pick a job from a bunch of choices. Those jobs are written on large popsicle sticks (from the craft store) or strips of cardboard and stuck in an envelope taped to the outside of the bucket. The kid picks a job, does the chore, and then gets the item back. It gives them a little control (choice of job) but it makes the consequence immediate and makes it more inconvenient for the child than putting the item in its place to begin with. I thought it was brilliant and wished someone had told me about it when my kid was doing what your kid is doing!
The goal of chores is to teach kids that many hands make light work, and that the family doesn't function unless people pull their weight. I don't know how old your younger one is, but if she's in a long play rehearsal, she's probably in elementary school. So every kid above the age of 3 can do something: sweep the kitchen floor, take her own dishes to the sink, dust, feed the dog, bring in the mail. Elementary school kids can load the dish washer and probably unload it (maybe watch the glassware), bring a load of laundry to the laundry area, wipe down a bathroom counter, sort laundry and put away, dust, walk the dog, take out the trash, sort the recycling, empty the wastebaskets. Tweens and teens can do their own laundry (not just put it in the washer - anyone can do that! The work is putting it in the dryer and folding/sorting it!), clean out the car, shovel the front walk, empty the cat's litter box, wash windows and bathroom mirrors.
Start with some basic assignments, then praise praise praise when done, and make it clear that YOU now have more time and energy to do other things. Have a family movie night, play a board game, anything that shows them the benefit of cooperation. You are not their slave. And you will build them with a bunch of skills they will need when they go off to college or the working world - self-sufficiency, cooperation, time management.
Good luck!