D.L.
Don't worry about her not holding her bottle too much! At 8 months my son would not hold his bottle either. We would prop it up and watch him closly. When he would drop it we would help him a little bit, but we stopped helping him a little bit at a time. He is 10 months now and holding his bottle just fine. We use the playtex bottles with the liners, so all he has to do is suck the rest of the air out and he doesn't even have to hold the bottle upright, which is hard for us to get him to drink from sippy cups, but he is slowly getting the hang of it. Put water into a sippy and offer it to her while she is eating a snack, if she has started on the little stars they are great for first time snacks, they dissolve quickly. Just remember, if they wont hold the bottle they wont drink from sippy's, or at least that is what I have heard.
You can also try this: Does she gets upset when you don't give her the bottle fast enough? If yes, then you can hold it in front of her. She will realize after a while that she is the only one keeping her from getting that bottle. Try this aswell for a couple of weeks and she should start holding her bottle
Good Luck!!