If you decide to fill the holes, I wouldn't suggest using polymer clay like Fimo. Despite what a lot of people believe you cannot cure it without baking so stuff like boiling it does not work.
Personally, I'd just clean her up and leave her alone. Adding more chemicals to the mix isn't necessarily going to be great in the long term. She looks fine, a little beat up but fine imo. But you posted this in Customs, not the Corral, so that's probably gonna be an unpopular opinion.