this group can help you, if you get stuck filling in the online application. No need to post your passport off either. Can apply within 3 months of travel date.
passport holders from Russian Federation can get 30 days visa exempt, I think. And then she could apply for Education visa. Some people pay agents to expedite this.
Do you mean visa on arrival or visa exempt ? The latter is 30 days and can be extended for a further 30 days . Or apply for a TR visa before you arrive in Thailand, and gives her 60 days and can be extended too.