There's no solid evidence. (You can put away the attorney, Mr. Thiel.) Experts in the field, in a recent series of interviews with Dave Farina, generally agree that somebody must be funding Hossenfelder. Right now she's associated with the Center for Mathematical Philosophy at LMU Munich; her biography there is pretty funny:

Sabine’s current research interest focuses on the role of locality and finetuning in theory development. Locality has been widely considered a lost cause in the foundations of quantum mechanics. A basically unexplored way to maintain locality, however, is the idea of superdeterminism, which has more recently also been re-considered under the name “contextuality”. Superdeterminism is widely believed to be finetuned. One of Sabine’s current research topics is to explore whether this belief is justified. The other main avenue she is pursuing is how superdeterminism can be experimentally tested.

For those not in physics: this is crank shit. To the extent that MCMP funds her at all, they are explicitly pursuing superdeterminism, which is unfalsifiable, unverifiable, doesn't accord with the web of science, and generally fails to be a serious line of inquiry. Now, does MCMP have enough cash to pay her to make Youtube videos and go on podcasts? We don't know. So it's hard to say whether she has funding beyond that.