Your 1Q

@Graham *******

did the gf or owner report your stay with her at immigration

If not there could be an issue at immigration if you try to do yourself.

Last year a mate of mine stayed at his friends condo, neither reported address of stay. When he went to get 30 day extension by himself he was fined 2000b for non reporting.

Using an agent maybe best option.

Maneerat soi

So good visa

There are plenty that can help

Maneerat soi

32k or 35k with multiple entry

Sounds like they only will arrive with the 30 day free exempt Visa. if they stay longer they will need to apply and pay for an extension , can do this when in Thailand. or if not pay fine when leaving .( even for just 2 days) - Maybe do a short trip to Cambodia ( Phnom Pehn or Siem Reap/Ankor Wat) for a few days, this will give them another 30 days on return if fly or 15 days overland. also if you have a return ticket to/from the USA there should be no problem.

Now I try and avoid them , and line up with a male officer

@Michael *******

, yes it happened to me about 16 months ago with a lady IO. - I travel to Thailand 4 times a year for weeks at a time , on 30 day visa exempt. She questioned me why I come so often , do I have a wife or gf, what I do, where I staying etc ? And next time I need a proper visa. As I was coming back in 10 weeks I did a lot of research , called the Thai embassy in Sydney, went to a few visa shops in Pattaya, all gave different answers, , I just went with what the Thai Syd embassy told me, "there is no set rule on the amount of times flying in and out on the 30 day exempt visa, it's up to the discretion of the Immigration Officer on arrival.