Wow. A friend of a friend bought property she couldn’t afford with loans she can’t upkeep and now wants to borrow money from you.
This is a no-brainer: give her what she wants! In fact, I’d take this opportunity to increase your karma by giving her double whatever she asks for.
But be careful, don’t offend her by demanding any written contract. After all, she’s a friend of a friend and you don’t want to damage that type of relationship over something petty like money. If you have it just give it to her, that’s what friends of friends are for.
Now that we’re all friendly, can I have your name and phone number? I have some other opportunities I’d like to discuss with you.