This question is way too vague. Haley Stevens was very publicly huffing her own farts during the primary so its entirely possible that she just did that all on her own accord. Unless someone leaks chat logs its an entirely unfalsifiable question that AIPAC "made" her do anything.

I also don't see why driving a wedge in the democratic establishment is beneficial to AIPAC. The democratic establishment is still pretty solidly pro-zionism. Fracturing that block would have created room for anti-zionists.