Have your tried a probiotic? If it’s really bad, I would consider seeing a paediatrician. Reflux and colic aren’t considered the same thing. My daughter was like this and she had severe reflux and had to be medicated. We used to keep her upright for a minimum of 15min after feeds and I eventually had to cut out dairy, as I was BF.
We had a gassy and reflux baby so I empathise, it’s not easy. We saw paediatricians, GPs, etc and no one could really help. A combination of probiotics plus Willbys (it’s kind of expensive though) worked huge wonders for us, not a complete solve but sooooo much better. Also baby wearing was the greatest thing as lying down in prams was not comfortable for baby, and when he started to sit on his own all problems went away completely
So sorry to hear that! Are her nappies ok? I think talking to your gp is a good first step because there are different options like osteopathy