I figured she was a bit thin. My retic was eating jumbos at that size, but larges for a few meals until she thickens up is probably a good idea. I'd feed her every 2 weeks, so as not to shock her system, though every 2 weeks is (imo) a good regular schedule to keep at that size.
If she's a mainland, expect her to likely hit a major growth spurt once she starts eating normally with you...she's only 2 years old, so she may not actually grow too awfully much too quick, either. Either way, don't expect that 6' enclosure to last long!
I just want her happy and healthy. I don't mind big. She will have climbing platforms and logs to enjoy as well.