I have been following your other threads, but not posting as I have always been unsure of what to say. It's a sad situation, and since I am pregnant and hormonal, I decided to just stay quiet! Hugs to you, the whole thing sucks.
I don't really know much about formulas in general, but I have seen "follow-on" formulas in stores, for when babies are on solids. I am pretty sure Enfamil makes one. I am sure others will know more about them than I do.
Yes, Trader Joe's is here on the West Coast (in CA anyway) and I am pretty sure in other places. I pay $2.69 for a half-gallon, which is okay.
How is her intake of solids etc? Her drinking Rice Milk shouldn't affect her sleeping through. But I know there are other factors at play...you'd probably feel better if she was getting formula at her biomums because she can't be guaranteed good food there anyway.