Until 15 years of age, minors will not be financially fined, after 15 years until 18 year they will be financially fined but do not get blacklisted due to overstay.
As she is 17 years, she will be fined for overstay but not blacklisted.
You might try the Extension of Stay based on being unable to travel but with all restrictions getting lifted, make a plan B like short trip abroad.
The truth never hurts. But you might write down you are unable to travel due to covid contaminations world wide, or just I like to stay inside Thailand.
I have been told, BUT what date is mentioned on the stamp inside your passport ? If that date is 6th July you have to go back on that date to the Immigration Office OR stamp out the country on or before that date to avoid being in overstay.
If you fly out on the 7th early morning, check in and stamp out late night on the 6th.
I know that the Non Immigrant O visa where O stand for others has many reasons, that is why the Embassy always put a small stamp like "Thai Wife"on the visa. As this e-visa is new I like to see how the reason as you mentioned "Thai Wife"and the reason depending on foreigner with long stay are mentioned on your E-visa.
As soon as you get a visa you need to check the details.
a Thai Wife absolutely does not need a Work Permit to work inside Thailand, so both people do not have the Thai Nationality, How could you accept on receiving this Visa the text based on Thai wife?
I understand mistakes are made by an Embassy, but accepting being a Thai and then travel with that visa is taking a risk as denied entry is a big possibility by using this incorrect visa.
There is officially no maximum on how many times a year you can use the Visa Exempt Entry by air, but every time you have to hand over your passport to an Immigration Officer who has a duty to check why people come to Thailand.