I had a break down earlier in this thread. Before she removed the display of how many fans she has. She had around 7800 fans at a cost of entry of 12.50 a month. 7800 x 12.50, for 97,500 before Onlyfans takes their cut/taxes.
She's also able to send picture sets/videos for purchase. Like the one video that was posted earlier, I think someone said that was 30-40 dollars? We'll never know how many of those get purchased, so there's no way we'll be able to guess accurate figures for how much she's making.
There are legitimately attractive women who use that site and also make tons. But Moo is out earning the vast majority of them.