Soldato
How does that song go again? I ain't saying she a gold digga, but she ain't playing wi'd no broke ******.
If she has 45k spare, she clearly isn't broke.
I don't know the specifics, but when you get into a relationship where people already have assets, you have to tread lightly. It's up to the OP if he wants to give up part of his investment or not.
It just needs to clear on what the expectations are and why she wants to invest.
Just remember, if you part, you would need to give money back and that would mean having to pull it out of your equity, which might cost you in taxes.