We went to the GP (who, btw, I don't think has a ton of knowledge with reflux in infants, since he originally told me that Hayden was just a colicky baby and that I had PPD) and he said that he thought her Prevacid dose should be enough. He thought that I should be giving her a bedtime snack with protein and change her milk back to full fat. He thinks she's UT and that she'd have better nights if she didn't nap. I'm not convinced that it's her reflux (but I'm not sure that it isn't iykwim), so I decided I've give his suggestions a go.
So for the last three days we haven't put her down for her nap. She has fallen asleep for 20 minutes in the car each day and is a bit miserable, but her night sleep has seemed to change. The first night she woke at midnight, asking for a snack (which I didn't give to her). I told her firmly it was bedtime, she could have water if she wanted but she was not coming out of her crib. She was mad but quickly got over it and went back to sleep. The next night she woke at 4 am asking for a snack but we ignored her and she gave up after a minute or so. She hasn't had any EWs, but she is very tired during the day. I do feel somewhat like I am torturing her, though.