So this is a new thing? And it started around the time she started daycare?
I don't know much about reflux, but it truly sounds like she is taking in too much air. Even one feeding during the day of taking in too much air will affect her all day. IF she's drinking out of a fast flow bottle, she's gulping and possibly eating too much. Plus if your milk comes out fast she's gulping. If you have a big letdown (ie the milk spraying out even if she's not sucking) then thats probably the culprit. Let her latch and when your milk lets down, unlatch her nad catch the spray in a towel. When it slows then relatch her, and only nurse from one breast, don't switch sides. If you allow her to nurse from one breast only per feeding, she will get the foremilk which will quench her thirst, and then the fatty hind milk which will satisfy her hunger. Switching breasts means she will nto get the fatty hind milk, and she will get hungry faster and be fussier.
So, check the flow of the bottles at daycare. At 3 months she should still be using a slow flow nipple, and burped often while bottle feeding. And assuming you are pumping for daycare, but if you are using formula, that may be your problem since formula is extremely hard to digest and hard on her system and WILL affect her.
Slow flow bottles, catching your letdown spray instead of letting her gulp it(which will slow ina month or two, you won't have to do this forever!), and only nursing from one breast per feeding should help her out. Breastmilk is a natural antacid, so if it is reflux keep nursing, its thebest thing for her.