If you are worried and want her to eat more, you can definitely try live. There's no issue with that. Some of mine won't take f/t but every now and again when I'm in a pinch I feed the f/t feeders f/t. I have no problems switching back and forth from live to f/t with the f/t feeders.

I had one at a year and a half old that would refuse every 3rd meal like clock work. I wanted to breed her and my other virgin girls in 2010 so I started tossing her an extra meal on the weeks she would eat. She ended up being my largest virgin girl.