I would keep her in the tank til you save up enough for the rack. as you said shes doing fine in it now. Most people dont move females to 41qts until theyre over 2000grams. Some keep all of their snakes in 32qt no matter their size. I recently built a rack, as a tie over until i can save up for one like you, and used all 41qt tubs. My 300gram cinny boy and 1200gram normal girl are both doing fine in it. They had zero problems with the move. And they both shed like 2 weeks after being put into the tubs too, i found that sorta peculiar lol