Relcelestia, I don't believe there's any way to tell who left what kind of star rating. The only way you'd be able to know what she left is if you knew the status of your star ratings before she left feedback; if they suddenly went down after her feedback, then she left bad stars.
I think ebay will either just remove the comment or remove the feedback entirely. Either way, I don't thinks she'll be able to give you feedback again once this is done. I would definitely report it, or at the very least, respond in comment to the feedback. It's not your fault customs are expensive and you were only being true to the value of the package.