She's a yearling, last weighed at 860 grams by the breeder on 10/17. I thought it was odd too, but he had it down in her feeding records that she ate a small rat some times and a hopper others. I'll post a snippet of the breeders records.

Aug 22: 645 grams
Aug 24: 1 LSR
Aug 31: 1 LSR
Sep 05: 1 LSR
Sep 15: 680 grams
Sep 17: 1 LSR
Sep 19: SHED
Sep 25: 1 LLM
Oct 05: 1 LSR
Oct 12: 2 LHR
Oct 17: 860 grams
Oct 20: 1 LSR
Oct 27: 1 LHR
Nov 07: 1 LHR

LSR is Live Small Rat, LLM would be Live Large Mouse (no idea why only a mouse) and LHR is Live Hopper Rat according to his key. She had her first small rat 6/30, a couple weeks before she weighed at 540 grams. I use paper towel as substrate to make checking for mites easier, and her hide is a spare rock hide I got when I adopted my first snake (thoroughly cleaned of course) and it's snug. She's in a 26.5 quart tub with the one hide, water bowl, and plastic plants to make up for the lack of a second hide. The tub is on a bookshelf so it's surrounded by three sides and top and bottom and should feel almost like being in a rack.