I would say she is fooling around with you. If she is doing this for 2 years, ask yourself critically if a women stays so long single? Why does she want to marry you at once? What are her intentions? What is her financial background? What are your own expectations for marriage? What your expectations to a woman?
What if she isn´t a woman at all? Honestly if you never received a foto in 2 years nor took the chance just to speak with her in Skype, then it sounds pretty weak. What do you know about each other? Just short text messaging?
On the other hand, why you do not just confirm to her wish, in order to meet her. If you then see that she is very ugly you still can change your mind.
There is no guarantee for marriage at all.