Can my mother-in-law re-enter Thailand from Cambodia with a single entry visa?

her mistake was, she entered on a single entry visa (tourist visa?) which gave her 60 days. she could have bought a single re-entry permit for 1000.- THB, which would have kept the 60-days stay permit she received with her SETV alive, and would have been able to re-enter Thailand using this re-entry permit. . . .However now this is blown, so Plan B must be: fly from Cambodia to the BKK Suvarnabhumi Airport (use Thai Airways and NO OTHER airline!!) on the day of her return flight to Brazil. She can remain airside in the transit zone for a maximum of 24 hours, without the need of obtaining a transit visa

There is not much she could do within the short period of 8 days left, as a single entry Tourist Visa application in Phnom Penh would require an appointment and many more days of wait . . . . . Does she have a flight ticket back to Brazil? Then she can book a flight to BKK Airport (no other airport, watch out!!) on the same day her flight will depart for Brazil, with enough time between arrival flying in from Phnom Penh or Siem Reap, and departure of her international flight. She will then remain in the transit zone and does not need to enter Thailand. Keep in mind that either her baggage must get checked through. If this is not possible, she must travel with her handcarry only

She can apply for a Thai visa at the Thai Embassy in Phnom Penh. It takes 3 working days. Here's the list of required documents: e39c46fa1&menu=5d73be39c46fa2

She has to go to the Thai Embassy in Phnom Penh and apply for a new tourist visa. Check the requirements but I think it takes 48 hours and she will need stamped evidence of financial resources like a bank statement. A printout of bank statement is not enough, they love their stamps.

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Without a valid visa, she will not be able to enter Thailand. She should have purchased a re-entry permit before she left. It's odd that the travel agency didn't arrange this or at least notify her.