I am posting this for my friend.

She has TV double entry.

She enter Thailand with 1st TV on 1-April and then she got permission until 31-May.

She for got to extend here visa until now.

She still has 2nd TV but don't know what to do next in this situation.

Can she still extend her first TV even she is over staying already 15days?

Or She should not extend her first visa and she should cross border for 2nd TV?

Either way she will need to pay the overstay fine. Any extension would be dated from 31 May, so she is already 15 days into the 30 day extension period. Also, she needs be be mindful of the visa expiration date.

Either way she will need to pay the overstay fine. Any extension would be dated from 31 May, so she is already 15 days into the 30 day extension period. Also, she needs be be mindful of the visa expiration date.

Thanks for your information.

I will tell her to go to immigration to pay fine and extend her visa.

Although that might work she really has no stay to extend as she is way overstay. Expect she would be best served to leave and pay overstay and return on second entry.