Hi all, I have a question regarding visa extension.

My friend is currently in bkk with a visa on arrival. She’s here for a IVF procedure and the doctors told her the whole process will probably be done by 20th May. Is it possible for her to get an extension without having her to go to the immigration office directly? She has a letter from the hospital stating that she should avoid traveling or moving around too much.

And apart from the documents from the hospital, must she provide any letter from the hotel she’s staying?

Thanks in advance for all the help