Secret footage captured by Mrs Worrall's family shows care workers treating her roughly and even slapping her at the Ash Court care home, which has previously been rated as 'excellent' by the CQC.
After noticing bruises on her mother's arms, Jane Worrall set up a camera to film her mother's bedroom for 4 days.
The footage she saw was shocking - her mother was being roughly moved by staff instead of using a hoist, and one worker - Jonathan Aquino - even slapped Maria in the face six times.
Other discrepancies by staff included feeding her too quickly and rolling her over on the bed manually.
Now the CQC is being criticised as not doing enough to protect the elderly in care homes, and since the incident the Commission has concluded: "Ash Court ensures that people who use the service are protected from abuse, or the risk of abuse, and their rights are respected and upheld."
Forest Healthcare, which manages the home, say the assault was an isolated incident, and that Ash Court is "committed to working closely with all families and residents" and that they receive positive feedback on their care, which is subject to "continual improvement".
Jane Worrall spoke of the conclusion; "When I read [the report] it was just another slap around the face. I just felt like they'd basically given [Ash Court] a clean bill of health again, bar two minor adjustments.
"It makes me worry for other people who are potentially about to put a relative into a care home."
The five staff who were caring for Maria Worrall have all been sacked, and Jonathan Aquino has since been sentenced to 18 months in jail.
Mrs Worrall no longer lives at Ash Court care home.