What should my sister's friend expect at immigration after overstaying her visa in Bangkok by six days?

Hello. Can you please help. Need some advice. My sister's friend is in Bangkok now on a 30 day visa exemption from Australia. She has already had it extended for additional 30 days for tourism. She was supposed to fly back home 5 days ago (last day of her extended visa exempt) but has been sick with severe diarra or food poisoning for 5 days and could not fly or even leave the room to go to the immagration office. She is well enough now to go out again and plans to go to immagration office tomorrow. She has not yet booked another flight back home. What should she expect given that as of tomorrow she would have overstayed for a total of 6 days? Is it likely she will just pay the fine and then get a 7 day stamp to give her time to book a new flight and do pcr test requirement etc to go home?

Thanks.