Of course this is just my opinion, but she's being really insensitive. She gets to have two very beautiful furbabies free of charge, that would be anyone on YT's dream come true!!!! Yet she criticizes you for your breeding practices and even talks about the price of the puppies, which I don't understand why she would even do that at all. If it were me and you were offering me the puppies and I felt the way she did in her message, I would of never taken those puppies.
As a breeder you did everything in your power to get good loving homes for your babies, AS ANY GOOD BREEDER SHOULD! Am I right?
As someone who is a new yorkie mom she should have done her reasearch and if she was uncomfortable with your practices she could have simply said "no thanks."
I don't think your being oversensitive at all, she had no right to put you down in front of others, even if it's just in cyberspace.