Without a bank account or IDs getting that into Fiat will be tricky. Most exchanges want KYC verification and need you to link your bank account and government ID.

What about getting her to make an account on an exchange so you can just send her the bitcoin and she can cash it out? With the amount of money you're proposing to pay her, she'd be crazy not to work with you a bit to get it. You'd also be able to make the weekly power down payments directly to her exchange address to cash out without any middle man loan service.

That might alleviate any tax burdens on your end as well. You are supposed to pay capital gains tax on crypto you cash out, meaning 50% of the value is considered income and you pay the appropriate tax bracket. Giving her the crypto and having her cash it might be considered her income, which really it is.