Hi, maybe she has bad wind I usually find that holding a baby against your shoulder upright and cuddling them at the same time as bringing up wind helps. Also, you could try the avent variflow teats only on avent bottles and try her out with the different flow teats this saves having to buy seperate teats. I ended up using the Dr Brown bottles which stop air bubbles building up and really helped my daughter. It sounds like your baby really wants her milk but something is causing her discomfort it is just a case of trial and error. Good luck.