The seller lied...was prepared to give this pain in the neck to another.
(I hate that in people, btw.)
Slap their wrist by getting your insp fee back.
I like the petition from your agent idea.
I hope it would never reach small claims.
If you do nothing and blow it off, as if it was just a fine thing to do to another...
she'll do it again and again...I think you said 'she'.