About 3 years ago I had to renew mine , agent Pattaya , took 3 weeks 10,000 including price of new passport .. door to door .. saved me travelling and possibly staying over twice in BKK .. pretty good all round imo .
Should be fine .. it’s only if her flight gate is the opposite end of terminal .plus she won’t be the only person transferring I’m sure .and the connections flight will be aware of that