2 month old

Ell

Need advice... my 2 month old constantly roots. She is bottle fed. I dont know when she is actually hungry because she'll eat everytime. I dont want to over feed her. We have also been dealing with alot of crying. It's not colic. We've been to the doctor we've done acid reflux, gas drops, non milk based formula, she has a gi referral, so my main question is why is she rooting so much? Thank you.