nothing against SunnieSkys but you can't go by the 10-15% rule for a female that size. she sounds like she's been doing okay, and now that's she's with someone willing to put forth the proper care, she'll do just fine.
small rats every 7 days until she's over 1000g. then you can move to medium rats every 7 days.
sounds like she's in good hands.and SunnieSkys is good hands, too.
keep us posted on her!!!