She is a real physicist and not a kook, but she has been criticized for presenting her views (e.g. superdeterminism) as having much more acceptance than they actually do. She ignores and misrepresents counter-arguments regularly. Her ideas about, e.g. the explanatory power of entanglement wrt processions of moons around (IIRC) Jupiter are certainly well outside what I’d describe as regular astrophysics.
The golden standard of science communication was set by Sagan, and he always carefully pointed out when he was expressing a personal opinion, as opposed to one shared by the majority. Sabine Hossenfelder is no Sagan.
So proceed with caution. :)