actually, you are probably missing the boat here, and I think blinded by either love, foolishness or a false sense of philanthropy.
I am in a similar situation to you, for about the same time period, but with a different scope. And probably more money. And last time a thread like this popped up so did a bunch more pooners who admitted to the same thing. In my situation, though the person has taken on a financial obligation themselves that is pretty hefty and must be repaid at the end of things. So there was a responsibility taken on. But they are asking me for more money, and indicating they aren't in this trade anymore, and have limited funds such that this extra help is needed. So we have a fee for service agreement with guaranteed fee and services regularly, no freebies, but more than I would have normally done to be honest. So this amount covers a lot of her monthly expenses. In fact the demand on both our time is getting hard to deal with.
I decided to check up on some of the claims she made. It was pretty easy. First found out that yes, she would make new dates at better financial arrangement than I had, and second, that she was still seeing former clients, and finding a few new ones, but on a very limited scale. Advertising has stopped but now wonder if there is a new phone number and disguised advertising. So what difference does this make? Well, I would not support her for one thing to acquire the end product if she is going to continue in this business. And second, she wanted more money on the pretence of quitting. But hasn't. And claims that income owed from govt sources isn't coming. some of this I believed, was suspicious, but with a few investigative tips from a friend or two, have established that there is a pack of well disguised lies being tossed my way. I could walk, but I know the amount or reliance on me is high, and if I do it will blow her chance of getting out of the trade completely.
So yea, what do I do now! Frankly my gut feel is to tell her I know she is making more money than she needs and I am cutting my share, or maybe eliminating it. Think it would be better to spend the time on a beach in Hawaii than on her.