I've already voted for her, but I don't believe her.
This is a vague plea for peace without any indication of what things she believes (and more importantly, publicly acknowledges) would be "in her power". Is the limit of her power sternly worded letters, arms embargoes, or intervention? Because I'm pretty sue she's not opening the door for US peacekeeping troops in Gaza, though that would be in her power (at least for a short term).
But like, with Harris we get to see if she's willing to do anything meaningful, and maybe as public sentiment continues to turn against Israel she'll be embarrassed enough to do something. It's not a hopeful position to shoot for, but it is technically better than the alternative, and there other issues at play where the difference is not so limited.