Strictly speaking no, but it depends on how often or the nature of this volunteering. If it's a regular thing, whereby she would be associated with a charity then she would need to be on the correct visa class. If it's a one time thing alongside lots of other people, like tourists do sometimes, just handing out a few gift baskets to some poor hill tribe villagers for an hour that should be OK.
It's too early. Wait until maybe a week or two before the first 180 days are up, meaning early January and then, maybe, will we know.
In Thailand, never expect a lot of notice given for anything. That's not how they do things here. It's almost always a last minute thing.
We saw that during Covid, when tempers flared because Thailand was the last country in the region to announce an automatic extension of stay for all foreigners stuck in the Kingdom.
They should have made an announcement 1 month earlier, as they knew borders would be shut.
Definitely nothing needed to re-enter on a DTV, which I've already done.
On that trip, I was more meticulous about ensuring I have all the required documents to cross each border by car, including having Cambodian insurance, my international drivers permits, Thai license, international transport permit, print outs of the Cambodian customs form and even a paper copy of my Cambodian e-visas (2 copies are needed) than worrying about my re-entry to Thailand using the DTV.
I knew if questions were asked, I'd simply answer them and be on my way.
The car was more of an issue and I spent a good 15 minutes talking to customs requesting they stamp my booklet, which they don't ordinarily do at that border, because it's needed to cross the Lao-Cambodian border, which of course no crosses by car except me. Lol.
You can't transfer visas to another passport. You have to carry both passports. With the e-visa, maybe you can request the consulate to issue a new e-visa with your new passport details. Otherwise, you'll also have to carry both passports with you.
Keep the baby at home. Traveling with a baby is a hassle and even worse, applying for a visa with a baby in hand is not a good idea at all. It will be far easier to do what you plan to do, on your own.
When my baby was born, I went to Laos to apply for a new visa on my own. I didn't bring my wife and son, because we deemed he was too young (being only 2 months old) and it would have been a hassle. Constant need for breastfeeding, mommy can't do anything but stay in the hotel room the whole time, what's the point, if it's just for a few days.
