Sorry I thought I had attached them earlier.(I don't see that you've posted any pictures above.)
The problem is that the listing may not have shown that corner so it'd be difficult (if not impossible) to prove to Mercari that there was no scuff prior to sending it. (Did she send a picture of the scuff?)
No, she can not send me any pictures. I believe she would send to Mercari when she filed the claim. I have 5 stars review and I inspect and take pictures before I ship things out. I hope she did not make any scruff so she could have the proof and ruined my bag

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