What visa options are available for a US citizen visiting Thailand for 65 days?

I think the O/P has enough choices for her Mom to look at the thai consulate's website in her country and see what is what as far as the requirements.

The worst choice is do nothing and show up on a 30 day visa exempt entry because even with a 30 day extension for 1900baht at the immigration office that's not the 65 days she needs in country.

They'd have to go back and apply for a second 30 day extension which would be denied (because you can only get one) and then they'd get the application for extension denied 7 day stamp to get out of thailand (also for 1900baht)

The least they should do is get a single entry tourist visa.

Good Luck (y)

I know your mum is from the U.S.A.

so you can have a look at a embassy there for the price etc.

In $

And with this visa no need to go to immigration for a extension.

Fee £60

Non-Immigrant Type O (Retirement (pensioner aged 50 or above with a state pension who wants to stay in Thailand for no longer than 90 days) - single entry only)

Financial evidence e.g. A copy of pension statement if the applicant is a pensioner, or a copy of 1-month bank statement showing your income from pension, or 3-month bank statement of at least £10,000

Confirmation of legal residence in the UK or Ireland

I apologize to the person who suggested the year-long, multi-entry Non-Immigrant Type O-A (Long Stay) visa as an option for the O/P's mother I didn't read the post correctly and thought they were only coming for a single trip.

That O-A visa (while it has significantly more requirements to meet to get the visa) certainly would afford the O/P's mother a chance to come and go here all they wanted to for a year.

The O/P stated their family member is coming for 65 days, let's stay on topic and get them a visa that will meet those needs,

No need to go wild and crazy with suggestions of this or that long stay visa.

As you were advised get a single entry tourist visa from a thai consulate in the US BEFORE your mom wings her way here, then have her get a 30 day extension of stay at the immigration office which serves the area where you live for 1900baht.

Yes apply for a 60 day tourist visa with extension +30 days = 90