I mean, she's Polish, not necessarily Jewish. Haven't looked it up, maybe someone can find out, but I was mostly laughing at the name.

But, to answer your question, just like any other group, Jews aren't a monolith. There are plenty of even explicitly ashiest and anti-Zionist Jews. Although Jews do have an extreme in-group preference, often their extreme leftism/progressivism can overcome that. Not really that mysterious.

Why on earth would a Majewski lend their political support to a Muslim?

Because we fucking live in either a simulation or Clown World. Honk honk.