Yes, you will know if it's an insurance case. Not hard to withdraw case files on a damage car here in Thailand. Just that no one have gathered it all like back home (carverteco or what's the name?) doesn't mean they don't exist.
Most insurance case cars that get damaged goes to auction, It's either written off fully as a parts car and can never drive on the road again or as a lightly damaged car. Flooded ones get deregistered and cannot be registered again. So "you never know is just bullshit".
I would be more worried about the condition of the engine than the actual structure, but that cost about 15-20k at top to fix. But if you like loosing 600k in a second, go with a new one 😉
learn thai will give you about 2 years. But if you actually go in for it and are a paramedic.. look into being a translator at private hospitals as you prolly know alot of terms in the sector.. My Swedish friend does that in Bangkok, gives him about 80k/month.
If you're going to live here you need money right?(as you said you aint rich) Open your own business in that field you'll be working in and get your money through that business. Non-b and WP solved. You might need to get some advice from a lawyer before doing so.
And what country in the European Union issued your passport? As Thailand is in Asia you need to be country specific, as they don't care about the European Union.
Just accept the fail and move on. Don't argue with a local, her info was the correct info. Based on experience her info matches, yours dont. Even if it is basically the same.
AIS Serenade, postpay ฿1899/month unlimited data at up to 2gbps. Special support number for you to call if you have any problem. Best of all, free coffee at bigger AIS shops and separate que.