IIRC the Arctic Mice brand feeders run on the small size anyway, the small rats are usually right at 50 grams (the ones from my local supplier run 55-70 grams). Assuming you're buying your feeders at the pet shop, she should be able to handle it. I'd handle her minimally for three days to give her time to digest the meal if it was on the large side.
In your other thread you indicated that she was a bit dehydrated so if she's taking f/t then offering the feeders wet will help with that.
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