Background: N is 9 months and 1 week. She is 22 lbs, 95th% height and weight. She's been eating solids since 4.5 months and basically eats everything we eat now in good size quantities. She drinks water from a straw cup as well.
She's been on Nutramigen since about 6 weeks due to early gut issues, but never any signs of actual intolerance. Just a lot of discomfort early on. She has had cheese, yogurt and a bit of milk and seems to be fine with dairy now.

Lately she's been refusing bottles. She acts like she wants it, and then gets upset when she takes a sip and won't drink it. My suspicion is that with all of the solids, she's realized how disgusting Nutramigen tastes and just isn't into it anymore. I'm trying to figure out what to do. She's not lacking in nutrition, but I hate to quit formula all together this early on, either.

Would you switch to a regular formula? (This is complicated because she's in foster care, so would involve the pediatrician, etc.)
Would you just phase out Nutramigen and start WCM early?
Mix the two in hopes of a better tasting bottle for the next few months? (I've tried this one and it does seem to help)
Something else I'm not thinking of?