This sounds like a scam to me...

Someone is telling you BS

Do not give anyone any personal information

As soon as you exit Thailand your current visa exemption is canceled..

When you re-enter you will get another 60 day exemption..

However your entry to Thailand is always at the discretion of the Immigration officer you are dealing with on the day..

If for whatever reason they believe you are not a genuine tourist and abusing the visa exemption entry system to live in Thailand you can be refused entry..

I wouldn't recommend living in Thailand with ongoing health issues especially anything likely to require an extended hospital stay..

Insurance will be extremely difficult to get and even if you find something it will be very expensive

Thailand has great medical private hospital care but it's not cheap especially for extended hospital stays..

They should consider perhaps just longer stays of a couple of months each year covered by a good travel insurance policy.

Long term Visa requirements maybe a problem for Loas..

Cambodia could be a better option..

You should focus on the easiest of those 2 for you to stay long term as that's what will be an issue for you in the long term.

I am not sure about the US requirements as I am Australian but I assume it's similar and there are difficulties and strict requirements particularly for younger Asian women.

They generally must demonstrate some ties back to Thailand to indicate they plan to return..

Family and a steady job are usually the minimum and also enough money to support themselves during their stay.

You may also be required to offer a letter of invitation for her and make a commitment to cover accommodation and other expenses it needed.

Those are just a few points I have heard though friends trying to get a tourist visa into Australia for women from just about anywhere in SE Asia and I expect the US has similar requirements.

Has she been making the visa application herself or through an agent?

In some cases the agents can be helpful as they are familiar with meeting all the requirements to satisfy immigration.

Unfortunately you have the cost of the Agent fees as well

WITHIN 3 days..

Not before

A 6 month multiple entry visa may suit if you are planning on around half your time in Thailand and half in your home country

@Sharon **********

Keep in mind Koh Samui is a very tourist orientated island and therefore you will be paying tourist prices for everything..

As a general rule it's always more expensive to live on an island than the mainland.

You should take a look at Hua Hin as a long term option.

It's very popular with retired Expats and foreigners staying long term.

No App available at present..

Apply by the website link

@Bartosz ******

Each time you enter it's a new visa exemption entry for 60 days..

When you exit Thailand your current exemption is terminated and canceled..

So each time you enter you are starting again on a new exemption entry

And each 60 day visa excemption entry can be extended only once by 30 days at any Thailand immigration office.