If she is from India, she'll have to get her visa from India. You can get a friend in Russia to write her a letter saying they will rent a place and present it when she applies for a visa. Thewn you must register at OVIR which in itself can be a nightmare. If I were you, I'd get a cheap hotel to stay at for a day or to so they can register the visa. If not, get a travel agent to get the Izvechenia and then get them to register it. Simple, but either way you have to pay. It is better than being hassled by the Гаи!