I would gradually switch your 06 at least to one hopper/weanling rat (something in the 30-50g range) every 5 days if she'd accept them... Starting with 7 days for a bit, then after a few weeks to 6 days, then to 5. Once she gets up to about 700 or 800 g I's switch her to small 'small rats' (50-70g) on a weekly basis. Unfortunately with the small rats I've found you also get some in the 90 or so range which end up sitting in the freezer for quite awhile!