Okay, I had no idea who the "she" was you were talking about, and now I understand.
I went back and looked at her posts from the past few days, and I completely disagree with your characterization of what she said. She repeatedly stated that she was talking about AIPAC the organization, and even corrected people who accused her of talking about Jewish people. She stated that she specifically was NOT equating AIPAC with all Jewish folks, something that I've seen come up before when people criticize Zionists.
I also think that if an NGO that is explicitly in favor of a settler colonialist project like Israel, and said NGO is unseating domestic congressmembers with millions and millions of dollars in spending, precisely because said congressmembers have criticized said project for the genocide they are committing, then yes I think there's an argument to be made that the NGO is acting as an agent of said project AKA Israel.
I mean, hell, the US uses NGOs for shit like that all the time, all over the world. And it sucks when we do it, too!
Now, I actually don't think having AIPAC register under FARA is actually that helpful, because as has been pointed out, the roots of Zionism are in the United States organically. A lot of it is due to antisemitism and based in US imperialism and having AIPAC under FARA isn't going to change anything about US imperialism. If the US lost access to AIPAC or became limited in how they could use it, they would just invent another org for the same purpose.
What AIPAC is doing strikes me more as a symptom, so for me I think it would be more useful to go after, for example, campaign finance regulation instead. But I can see why Dr. Gebru made that argument, and I don't agree that it's antisemitic.