Ella would only drink room temp bottles. Is there any chance she has a temp preference? Also, I wouldn't put too much stock into anything you've done to win the picky eater contest. My five-year-old boy survives, basically, on bread and milk (with an occasional banana and apple). He eats what he needs to grow, but never in excess - ever. My daughter, OTOH, has always loved everything we've eaten: beans of any kind (chickpeas, blackbeans, pintos, etc), rice, salsa, Mexican/Japanese/Indian food, she doesn't care if it's all a big pile of smooshed up mess on her plate or in individual sections. She's never met a fruit or vegetable she doesn't love. Their eating habits are night and day. When they were babies, we did everything the same - introduced solids at the same age, introduced foods in the same order, offered table foods at the same time - and it made no difference in the kind of eater they each became. When Ella was a baby, my mother and MIL both were insistant that "they" would ensure this baby was eater (implying I was responsible for the kind of eater Nicolas was). Clearly, this was all phooey. Do what you need to do to get her to eat; I know from having one of those kids who dislikes eating how hard it is NOT to blame yourself or something you did for the difficulties.
It sounds like Alysha has given you great advice about how to get some calories in her, too. These little ones never make anything easy, huh? ;)