Did she enter Thailand on the UK or Thai passport? If she entered thailand on the UK passport then she needs to leave thailand on the UK passport as well.
But if she can get out of Thailand she should be ok to enter the UK w a expired passport.
I noticed you use IMG Global for your insurance. Ive done them before for short trips. Which policy did u get and how does it seem to be working out for u? Any suggestions or hints?
My Thai embassy in Chicago is stating 3,000,000 baht in a Thai bank for the OX. Unfortunately our USA embassies won’t give us funds documentation, therefore we gotta put up the money in Thailand for the OX.