I don't think this is a problem at all. Last week I fed my assumed male (Not proven) three small rats. Not because I had some that were thawed and refused. I had to thaw the second two and I fed the three over a nine hour period of time. See my post here.

Today, eight days later, I offered him another small rat and he ate it with the alacrity of a man who has been starving for months.

When he ate the three rats he started out at ~1130 grams, much smaller than the female you're talking about.

In the thread I linked you, you will find that dr del linked six posts by Adam_Wysocki about feeding smaller size rats than the 10-15% "standard" opinion size. I'm going to follow his observations as closely as I can.

She's a big girl and Adam does feed the big girls more at times, so I think you're doing great.