She made her decision after backlash from "pro-Palestinian" activists, who told her that Rabin was a monster and that Palestinians are worse off after Oslo than before.
The event is sponsored by Americans for Peace Now.
In August, there was another clear split between Peace Now and the far socialist Left, when Peace Now praised the Israel/UAE agreement and the socialists were horrified by it.
There is a common thread here.
Peace Now supports Israel living in peace and security in the Middle East. While I strongly disagree that their policies would result in such an outcome, their motivation is based on ending the conflict and leaving an Israel at peace with its neighbors.
On the other hand, the socialist Left is against Israel making peace with anyone under circumstances that leave Israel existing as a secure Jewish state.
If you look at Peace Now and see a racist, apartheid-supporting group, as the Israel-haters do, then you aren't against racism or apartheid. You are against the existence of a Jewish state and using codewords to hide your hate.
These two examples show how the socialist Left, that is making increasing inroads in the Democratic Party, has an effectively antisemitic agenda - the destruction of the Jewish state and its replacement with a Jew-hating, terror supporting Palestinian Arab majority state, which they ludicrously claim will treat Jews with equal rights. Sure. The same equal rights they have under every other Arab regime.
When Peace Now is too far to the right for you, you are not interested in peace. You are against any rights for Jews in the Middle East.