I am not doubting you in anyway but this sound like a fiction; how do you think of a woman contacting you without having a business deal before or even being link to someone that already established. You and I knows how it's for you or anyone else here to send you money or bitcoin without an escrow.
Right, I am not getting OPs story too. A person that knows Bitcoin and wants to Invest does not know anything about crypto exchange and if you were able to do all that for her and she bought the Bitcoin, where did she store them? she must have had an exchange wallet or she has a personal HD wallet which means she must know enough to do this by herself 
Just think through the story.