Previously, she was suspended - and later reinstated - over additional alleged antisemitic posts.
Plaid Cymru MP Liz Saville Roberts is now carrying out a review of the party’s antisemitism policies.
“After Plaid Cymru let her off twice before, it was inevitable that Sahar Al-Faifi would spread baseless conspiracy theories concerning Israel, tapping into old antisemitic tropes,” Board president Marie van der Zyl said on Thursday.
“If Al-Faifi isn’t expelled this time, then any review will be seen by the Jewish community as a sham.”
A spokesperson for the Welsh party said it “takes the issue of antisemitism very seriously” and defended its “proud and longstanding record” of fighting prejudice and discrimination.
"Antisemitism must never be tolerated and should always be confronted whenever and wherever it arises.
“Plaid Cymru is committed to ensuring that its culture, structures, and processes fulfil a zero-tolerance approach to antisemitism."
Sahar Al-Faifi was approached for comment.
