Walker's defense was a standard-Livingstone -- "I'm just criticizing Israel" -- so let's review what the core offenses were:
- Saying Jews were "chief financiers" of the slave trade;
- Complaining that Holocaust Memorial Day is biased towards Jews because it doesn't commemorate other genocides (it does, actually);
- Questioning the need for heightened security at Jewish schools and institutions because Jewish concerns about potential targeting were exaggerated or embellished.
You might note that none of these actually have anything to do with "criticizing Israel". Indeed, that's a characteristic she shares with the original Livingstone case, where the antisemitism charge also had nothing to do with Israel at all.
Walker had been a major standard-bearer for "Labour Against the Witchhunt", which insists that the bulk of the controversy over antisemitism in the party is falsified or made up, the plot of Zionists or even the Israeli government to damage the prospects of Jeremy Corbyn.