When to change feeding schedule

[Brently]

I am just curious on when it is appropriate to start to space out feedings more. I feed Athena every 7-10 days depending on prey size. When she eats around 100 grams it is 7 days, anything over 140 grams I go to 10 days. But when do you start spacing it out more, or do you at all. She is 4ft long and weighs around 100 grams (2 lbs). And she is approximately 1 1/2 yrs old.