Is this reflux?

DD is 7 weeks and was diagnosed with reflux about 10 days ago. We began Zantac 2x per day. She now does this thing where she will take 2 of her 4oz of formula and I burp her and when I go to give her the bottle, she gags and pushes the nipple out of her mouth. Usually she will take the bottle again but maybe 10 minutes later. I would say this happens 75% of the time.

Otherwise she is doing so much better. Less fussiness, less (almost no) spit up.

Is this reflux?

A lot of reflux babies do much better with less oz wise per bottle, but being fed more often (ie every hour vs every 2-3 like other babies)

My dd had reflux and would drink less oz per bottle but more often and sometimes still does that now that shes outgrown it and is older and can def drink more.

I would say it could be normal. Maybe after a burp she needs a few minutes to settle her stomach or something. Sometimes it can come up in their throat but not spit up so it could be that also and therefore she needs a minute to settle and then she wants more. I don't think its anything to be concerned with.
Sometimes after a burp mid bottle my dd wouldn't take the bottle again for 20 min.