The imprinting onto mice is waaaaaaaay over hyped. I have never had an issue switching any carpet. But, to answer your question, it's a little hard to tell from those pics. Remember, hatchling JCP's only weight like 30g so 70-80 at 6-7 months isn't too bad. Each snake grows at their own rate. If you've gotten her to eat 3 times in just over a month, sounds like you have nothing to be concerned about.