Leave her the hell alone when it comes to this subject. Nothing good will come of it. No matter what happens it'll always be your fault. Goes up? You didn't get her to buy enough. Goes down, you talked her into it. Hacked, wallet failure, meteor takes out every exchange - your fault.
Exactly... As much as we would all like to convince everyone around us to buy Bitcoin, you just can't force it upon anyone. I get that some people are pushing for converting others to up the value in Bitcoin, but it's just not worth the effort and solidifcation of Bitcoin's poor reputation.
Now, that's just in regards to friends and acquaintances. When it comes to your SO, you absolutely should NOT be trying to force them into anything financially. There is absolutely nothing good that will come from forcing your reluctant girlfriend into Bitcoin. If she makes more money than you, OP, she probably isn't a clueless person.