about what size (on average) do Columbians start to bulk up (width wise) because my lil girl is about 3 1/2 to 3 2/3 feet long because i need to know this so i can plan on feeding large rats because she is going through a fairly large growth spurt right now and im feeding her more then usual (like amount not size) and i started that when she started to get alot thinner quicker (when between meals) and when should i expect the spurt to end so i can move her to a more suitable cagefor her size