500 Baht on the lady!!
Seriously you should be careful. I train at a Muay Thai gym and i'm under no illusions that the 12 year olds there could easily kick my *** - and im not weak or out of shape. Simply their technique is better and they are absolutely ruthless, and fearless too. Remember it really doesnt matter how much smaller this lady is - one elbow connecting with your jaw and you're a gonna. Do as the others suggest swallow your pride and be respectful - if you had done that in the first place you wouldnt be in this situation
I'll pray for you