I had a RES a while back and the only time that she ever regurgitated anything was when I fed her the little reddish pink bites. I don't remember what brand they were. Have you tried to feed her any pellets. Like Zoo med or Mazuri?
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Mike

1.1 Peninsula Cooters(Matt & Katt)
0.1 Green Iguana(D Rex)
1.0.2 Southern Painteds(Badd, little ones)
0.0.3 Western Painteds
1.1 Ornate Box Turtles(Terra & Nate)
0.0.2 Pink Belly Alligator Snappers