I have oversupply and fast letdown and 2 of my 3 were very unsettled as a result (other one was happy but massive as a result!). I also completely and utterly agree with tiktok about being wary of immediately suspecting reflux that needs medical treatment, many, many newborn babies have reflux as the muscles at the top of the tummy are still strengthening. So I think she is refluxy, but I would let her come out of the newborn period (8-12 weeks) before seriously doing much about it in terms of medication or cutting dairy.
Anyway, what helped my own little nightmares. Block nursing as you are doing. Keeping feeds very quiet and calm, when I could, as babies trying to deal with a mad boob often cannot concentrate on anything else. Taking them off when the milk spurted and letting it spray into a clean cloth and putting back on when it was a dribble. Frequent but gentle winding and at desperate times using a wind product, like infacol or gripe water. A nursing cushion can also keep them at the right height for the full feed, other people lean back, when they can, or hold baby upright at the breast.
I would also help her deal with the after effects and the reflux which may or may not be pathological and make sure she is in loose clothing, nothing pressing on her tummy. Hold her upright for 20-30mins after a feed. Have all flat surfaces, including changing mat, propped up at an angle. Only change after a feed if you have to, otherwise do nappy before hand.
Hope some of this helps. If she is still refluxy at about 12 weeks, I would look for more help then.
Both my unsettled ones turned the corner from 20 weeks, not the traditional 12 weeks colic. I believe they would both have been nightmares on bottles too. I actually fed the second unsettled one until he was 2.5yo and it was SO lovely after he turned 6ms.