I would feed her normal food at least the first time. If she takes it no problem then try FT the next time. You should consider getting her switched to rats before attempting FT IMO. Just because it will be cheaper and easier to feed her 1 rat VS a few mice when she gets older. I would try a rat pink or fuzz (prolly fuzz), but that's up to you and what you'd like to do. Trying to switch her to rats and FT may be hard to do at the same time. Then again, some are fine with itjust depends on your little one!
Good luck whatever you decide!