Trying to Sell First Rental House and Buyer Ghosted
We are trying to sell a rental house we bought in 2019. I have a friend who is an agent, so she agreed to list for 1% as long as we handled the showings. We had a contract with a buyer that fell through after they did a further inspection and lowered their initial offer by $11.5k. After that house fell out, I had another buyer call, but I struggled to get him to provide a written offer. We did get a written offer once he hired our realtor as his buyer's agent. However, when it came to proof of funds, he provided a picture of cash. Unbeknownst to me, my realtor kept it from me that he hadn't actually put down earnest money, and he was well past the three days so we said we were canceling the contract. He responded immediately and said he would get it done last week, but of course, that never happened.
I guess I'm asking two things. The original contract was signed in early November, but the buyer didn't want to close until late December. As a concession, the buyer offered an additional $2k for the inconvenience. Of course, with no earnest money, that doesn't help me now. Is this some sort of weird scam or are there buyers out there that are doing this for kicks?
My second question is, can we legally hold our realtor or her broker liable since she kept it from us?
If you were in this situation (or have been before), what would you do?