Once you've been given your extension you can withdraw the 400k. You just need to make sure it's back in the bank 2 months prior to you next applying for your yearly extension.
Just open a bank account in thailand. You can do most things through wise but it becomes a massive pain in the arse if you are here longterm.
When she gets her ED-Visa her school should also give her a letter and be able to tell her which bank to take the letter too (if a language school) if its a proper Ed-Visa (university (Masters, Bachelor etc) then it doesn't matter what bank she takes the letter and student ID to as most will accept it.) However if it's a language school it's better to just go with the bank the school suggests.
no, but most will opt to ask for proof of onwards travel/a return flight that is within the either 15 days (VOA) or 60 days (exemption) if you don't have a visa instead as they will need to foot the bill on a return flight if you are denied entry and don't have onwards travel.
Most airlines will not allow you to board without a legitimate visa unless you have a valid return ticket or onward travel to another country within the 15-day (VoA) or 60-day exemption because they must foot the bill to send you back if you are denied entry.
If the airline will allow them to travel without a return ticket or onward travel ticket, there is very little chance they will encounter problems with immigration. Hence, I stated that they need to contact their airline.
The majority of airlines will ask to see a visa or onward travel within a specified timeframe, especially when it comes to VoA & Visa Exempt because if a person or people are denied entry and do not have a ticket out of Thailand they have to foot the bill.