Thank you, everyone! I will definitely look into the mail fraud reporting, and also see about posting to MHHR via somebody with Facebook. She said she doesn't deal on FB, but I'm sure hobbyists there also shop on MH$P where she was advertising, and would like to know.

It's extra-unfortunate because I did get positive feedback on her before all this went down; seems like something has changed on her end, to go from a reasonable seller to this.