If you doubled or (for argument sake) tripled that to take into account the group show etc earnings, you can see she's making above minimum wage from MFC for her 2 or 3 streams a month, which is enough for most people to live off, but not enough to have a lavish lifestyle, including paying for your parents bills and such.
So she could be making money from a side hustle - from a job to escorting, to entertaining her whales privately, or anything in between. That's all speculation.
What isn't speculation, though, is that viewer numbers have dropped dramatically from the early years of MFC. I've heard a bunch of models talk about the old days when they had vastly more users online. In Tifa's case, Jones shared a chart a while back from the early years where Tifa's peak online viewers were nearly 10 times as high as they are now, on average.
And back then, if you didn't pay to watch Group or Club shows live, there wasn't much around to catch the recordings for free afterwards. so there was a ton more viewers online, and paying.
My core point has always been that I'm sure Tifa made serious bank in those early years, and even a ditzy cam model should have been able to save and invest a decent chunk of that, and can now just do the bare minimum to keep things topped up.