And that would likely severely impact her chances at the presidency. The attack ads practically write themselves. Trump would just bring up the October 7 attacks, opine that how dare she side with Hamas, and promise to not to abandon Israel. As horrified as many people are by the current war, most aren't ready to completely cut Israel off, especially if it can be framed against Hamas.
No, politicians have to walk a fine line. Biden hadn't put much of a restriction on use of US weapons and his sanctions against violent settlers in the West Bank are ineffective. Israel has mostly ignored efforts to reign it in. Kamala could lay out some far more concrete measures that would get certain weapons revoked if civilian deaths remain high. At the same time, keeping Patriot missiles well stocked would not impact Palestinians at all.
American elites love Israel. Billionares, CEOs, Celebrities... The voters on the other hand do not care much about it. Israel vs Palestine divide is very much and elite vs ordinary folks divide. Supporting Israel does not bring votes.