You have a lot to lose.
Neither she nor her paramour are taking this incredible opportunity seriously. Some one (family, the state government, -someone) has paid for detox/rehab and the two of them are just throwing that away instead of appreciating what was given them.
If someone came into a huge amount of money and blew it on - I don't know - parties and a house they couldn't afford to maintain, would that look like a good partner to you?
If a person with no transportation was given a car to get to work, and refused to maintain it, left the windows open when it rained, got caught speeding often or doing other dangerous things, is that someone you'd want to hitch your wagon to?
Her value system is not your value system. Does that generally make for good partnerships?