To get a visa to the usa, the best thing to do is have the person travel to many countries and fill up the passport first with visas proving the person follows rules.
Then you apply for usa visa. Usa is rhe hardest visa out there. Did they ban
She has to file, it really has nothing to do with u. But before u file ahe should have several visas from other countries first to prove to usa embassy that she is trust worthy. Usa is the hardest to apply for, so make sure she travels plenty to other countries first. And remember the embassy in Thailand bans you forever if they don't like you from ever reapplying again. So don't mess up her possible only chance