she was part of the Biden-Harris administration when it issued a formal genocide determination regarding conflicts In Africa. She's spoken against war crimes and human rights abuses.
But I suspect you're not actually asking about that - you're asking about specifically if she condemned Israel's actions a genocide, and she did not. She stated that she wished the ceasefire would hold, and acknowledged that there was terrible pain in Gaza. At the time of the election, she, along with many others did not view the actions by Israel as a genocide. It was seen as an overtly unbalanced counter to the Oct attacks. One where Israel was allowing too many civilians deaths for targeting low value military targets. There was pushback starting, not enough, and not enough to risk losing Jewish votes and funding. Whether a Harris government would have limited the rampant escalation of Israeli violence that Trump allowed and encouraged, we'll never know. Probably it would have been less bad with Harris, since Trump has acted just about as bad as it could possibly be - and if that's what you effectively voted for, you are responsible for that.