I ended up not supplementing because I was unable to find anything about dosing and safety. Vitamin C is water soluble, which means any that isn't used immediately in body is passed through waste (pee) so while over dosing would be a small chance, it's not one I wanted to take. This also means that while I'm sure her body uses the vitamin C from her meals as fast as it can, any left over is passed in waste until she eats again.
I did, however, switch to feeding her smaller meals more frequently so her body has a more frequent source of vitamins than once per week. The smaller prey helps while she heals too, as there's less body stretching than one big meal.
I'm still toying with trying to inject a little slurry of a multivitamin powder into a mouse once a week, but haven't taken that step yet. I would like to do more research on dosing and solubility - anything fat soluble CAN be over dosed, and I don't want to do that.
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