Yes, you can always ask, but have plan B ready if the paperworks are not finalized and you have to come back on set date 26 May.

Takes the passport and the letter and visit Immigration Office for an Extension of Stay based on medical reasons.

As the advice is correct but it is a strange way and more expensive.

OR apply for the Single Entry Non Immigrant O visa based on marriage before you make your way into Thailand (2500 Thb) and apply in Thailand for the 1 year Extension of Stay (1.900 thb).

OR

Go to Thailand and get the free 30 day Visa Exempt Entry,

Go Immigration to apply for a 30 day Extension of Stay (1.900 Thb)

Go Immigration to apply for a 60 day Extension of Stay (1.900 Thb)

Go Immigration to apply for the Non Immigrant O visa based on marriage (2.000 Thb)

Go Immigration to apply for the 1 year Extension of Stay (1.900 Thb)

The same insurance as you had when you applied for this visa and used it to get 1 year of entry in Thailand.

The new and higher insurance policy is at the moment only introduced at some Thai Embassies abroad and the idea is that from 1 October 2022 it will be introduced at the Immigration Offices but that is not official as we wait for the announcements.

@Nick ******

Indeed no "hard and fast" rule, but people are not always capable to convert their Visa Exempt Entry or Tourist Visa into a Non Immigrant Visa. Sometimes Immigration has more requirements that an Embassy or the local office does not have the credentials to perform conversions.

As this Extension of Stay is only for children up to 20 years of age, you should be aware that there is a possibility that Immigration only allows her to stay until her birthday in Aug and you have to seek an alternative visa or Extension of Stay for her before her birthday.

The rule is:

I do not see any reason why Immigration Officers will put aside and question a 5 year old about overstay stamps in the past.

To avoid being worried, avoid overstay stamps at all time.

I would advice, enter for the 2 weeks using the Visa Exempt Entry, talk to the schools and Immigration to see what is needed to get you the visa by conversion of Visa Exempt Entry if possible,

Then visit Germany, come back with new Visa Exempt Entry and do the conversions

OR

If not possible to conversions, entry for the 2 weeks using the Visa Exempt Entry, talk to the school, get all documents needed and apply in Germany for the correct visa's for all of you.

Choise is yours.

I would advice to do at your local Immigration Office as the re-entry permit is valid as long as your current permitted to stay, no rush and no need to be nervous.