My understanding is that for growing, a smaller meal every 7 days will do a better job, than a larger meal every 10-14 days. I wouldn't give her a double-dose in a single feeding unless you are feeding her something MUCH smaller than her usual take (ex: we have a worm who can take a large fuzzy, but we have been giving him 2 newborn pinks at a time because we have some that we need to get rid of).