It isn't just that. By twitterizing the topic, she's actually eliminated the possibility of doing anything useful here.

Right now, the Netanyahu government is in talks with a far-right party that advocates annexation of the West Bank. Without this taint of anti-Semitism that she brought upon herself, she could have worked with progressives within the Democratic party to bring forth legislation specifically condemning the alliance with Otzma Yehudit. This would have put people like Schumer and Pelosi in a difficult spot, without much undue drama.

By venturing too close to anti-Semitic tropes on a public medium like twitter, she's eliminated the possibility of doing anything concrete in the short-term.