I don't know if you are transitioning her off breastmilk, or just want her to take a bottle of breastmilk while you get some mommy time.
My son does take a bottle at daycare, and we lucked out with him taking the first bottle we gave him. I would try a few others IF you want to go to the bottle. If you want to go straight to a sippy cup, you will most likely need to assist her - as at 1 my son still needs the help to get the cup tipped up enough. I bought about 6 different kinds and they all seemed like toys to my son.
Have you tried drinking out of the sippy cup? I tried one of my son's and my gosh! I could only get a few drops out. It makes them suck abnormally hard. The BornFree (I found it at Whole Foods), flows more naturally without drowning them. and I think it will be easier to transition to a normal cup.
That one seemed to click. We still only have water in it, so he can get used to it without wasting milk, but my sister just shipped up more, and tomorrow night my husband is going to try the sippy cup with milk while I am out. If he doesn't drink, he will be fine (and so will she). Dad may have a crabby baby, but if they are hungry enough, they will take it. If they aren't, then they will be okay till the next feeding.
Make sure that you take that time for yourself.