With nighttime potty training. I make sure we limit liquids after dinner time, and I always make sure she goes potty right before she gets into bed if she falls asleep on the couch I wake her up and make her go potty and go get in her bed. I've done this since my daughter was 3 and she has had ONE accident in bed and that was partly my fault for not enforcing her to go before bed that particular night. After my daughter was daytime trained I put her in a pullup at bedtime for a good 6mos. (paranoid on my part) and she NEVER had one accident. If she's having accidents on a regular basis at bedtime she may not be physically ready to be trained. Some kids bladder or they're muscles or something aren't fully mature til later on.
The general rule for potty training is they should be waking up from naps or in the morning dry that's the number one sign they're bodies are physcially able to be potty trained.
With daytime accidents make your daughter be in full control of cleaning up and taking care of the mess. After awhile she will see it's not fun and it's easier to just go potty in the bathroom. When she has a accident and wants to change her clothes only change her undies and donot let her change into something fun or different.Let her be in her undies or some really boring sweatpants or something.Maybe buy some cheap ugly pants and call them the accident pants she won't want to wear those.
I've made my daughter be in control of her accidents since age 3. She has to remove the clothing, rinse in the sink, put soiled items in the laundry area, go in her room and find new clothing to wear. Trust me it doesn't happen that often because it's not fun. I don't get upset with accidents either becuase it's no extra work for me and it's not my problem. Sounds harsh but it teaches independance and responsibility. My daughter is 5 right now and is very very independant. She also loves to change her clothes a million times a day ugggh... and it drives me insane. Just tonight she's had one 3 different sets of pajamas. If she didn't leave the house or get her clothes dirty that she briefly wore I make her put them back in the dresser by herself. I also started making her do laundry with me and fold and put clothes away she now see's the effect on changing so much she get's frustrated that it takes twice as long to put her clothes away as it does me and I remind her I don't change my clothes multiple times a day. Sometimes I just get irritated and tell her to go back to her room and put her clothes that she just took off back on. Or I'll say you can put your clothes back on or pick out pajamas but were not changing clothes. Aren't girls fun? LOL Well good luck!