Marriage with Girl on visit or omrah.

Salam Alaikum,

My name is Muhammad idris, i want to get married with a Russian Muslim girl living in Russia.
The girl's Father is passed away several years ago and her mother is alive. she has no other close relative. We both are agree with Each other to get married.
  She lives in Russia, how it is possible to invite her in to Saudi Arabia and to perform Nikah here.
is it Possible if she will come on Omrah with a group? or am i able to invite her on Visit?
Please guide me.

Thanks and Regards.

Muhammad Idris.