Unless they think she needs a barium swallow it is probably a waste of money and too much stress on Solrikka. Pigweed had to stay at the clinic for 12 hours for the test and it cost $5-600. Hopefully you get some answers when they call you back.I did call my vet this morning, but have not gotten a call back. The original vet who saw her is not in today, but the attendant said another exotic pet vet will try and call. The original vet did mention that there could be something going on which is causing her to lose weight, but didn't say exactly what that might be.
I'll try to see if I can get the test you mentioned, but it might be difficult. Getting an exotic pet appointment these days is liking finding hen's teeth (or duck teeth, for that matter.) I called another vet and they said 'no appointments until the 25th. Yikes!