@Gordon ********

If you can pay for her then you will be her sponsor therefore she won’t need financials. If you are staying with family you might need an invitation letter to support where you will be residing whilst there.

It’s a good idea to take out an insurance policy in case she falls ill for the time you’ll be in the Uk.

You just need to satisfy them she won’t be a burden on the state and leave when you say you’ll leave.

It only took me 20 mins at Bangkok Bank but I already had a non o visa.

I wouldn’t advise overstaying as it’s a black mark against you.

You can get an extension but that’s wasting a day at immigration.

I would opt for a tourist visa in advance then no more worries.

You just have to provide the documentation asked for. They need to know she has somewhere to stay and enough money for the trip or you will and she’ll return when you say. I got mine medical insurance for the uk as well for the trip. They make money from visas so as long as you satisfy the requirements there shouldn’t be a problem.

Check the ticket conditions as it will say how much the flight change is.