Hey, go for it then. If it were me, I'd cut my losses and the mental aggravation and move on. He's likely to lose more and not win anything in the end. Being right does not always mean you win.
Save yourself tons of trouble chasing her down and pay the 15k repair bill yourself. Chalk it up to experience and be thankful neither of you was hurt badly. If you do find her, she's likely to want you to pay her hospital bills and fix her bike. Let the sleeping dog lie.
How many people hit bumps like this when trying to come to Thailand and just say screw it, I'll go to ....? TAT has to communicate with immigration that this kind of stuff is not tourism friendly at all.