A few crickets (5 or less) every two weeks or so is plenty. I know you want it to grow fast, but at 7" she is already a big girl, the more you feed now the faster she will grow but in turn the shorter she will be living in your collection. The term "power feeding" is used in the hobby, and all that means is you feed your T's anything and everything all the time to push them to the next molt, but you have to keep in mind that T's have a set number of molts in their life. So the faster you get them to that molt, the faster she dies in the end.
You feed your T regular meals every few weeks and you could have her for a long long time to come.