B.W.
I would be willing ot wager she does NOT have reflux, but instead you have a forceful letdown and its making her gassy and upset. If your milk sprays out during letdown, you have a forceful letdown. This will make colic/reflux like symtoms in babies. Once you learn how to control it, the symptoms will go away.
Latch her on, and when your milk lets down, unlatch her and catch the spray in a towel, or a cup if you want to save it. WHen it slows or stops, relatch her. Only nurse her from one breast at each feeding, no switching.
I would not give rice cereal at this age. Her gut is still open and that will leach into her body. Try to blocking I described above, it will teach your body to slow the letdown and it will only take a couple weeks for it to slow on its own.