Nid oedd Ms Williams yn bresennol yn y gwrandawiad ond mewn datganiad dywedodd ei bod yn edifar yr hyn ddiwyddodd.
Ymddiheurodd am ei hymddygiad a dywedodd ei fod allan o’i chymeriad.
“Mae gen i gywilydd mawr am yr hyn ddigwyddodd ar y diwrnod hwnnw. Dydw i ddim yn falch o’r hyn a wnes i ond rwy’n cymryd cyfrifoldeb llawn,” meddai.
Ychwanegodd nad oedd ganddi unrhyw fwriad dychwelyd i addysgu.
Fe wnaeth pwyllgor CGA ganfod bod gweithredoedd Ms Williams gyfystyr ag ymddygiad proffesiynol annerbyniol gan ei bod yn mynychu’r ysgol a dechrau dysgu dosbarth tra dan ddylanwad alcohol neu wedi yfed alcohol.
Roedd Ms Williams wedi dysgu yn yr ysgol ers mis Medi 1999 a bu’n bennaeth cemeg rhwng 2013 a 2020, ond fe ymddiswyddodd o’r rôl honno wedi’r pandemig.
Cafodd ei gwahardd rhag dysgu am gyfnod amhenodol, gydag isafswm o ddwy flynedd.
BBC News
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