Maz 'visiting her often' was said just after the narrator said the child required long stays in hospital. Her serious health problems 'require long stays in hospital, and Kenzey's Mum Maz visits her often seeing first hand the care she requires'. That referred to Maz visiting her in hospital, not visiting her in someone else's foster care. Maz has also arranged visiting a cerebral palsy centre once a month and music therapy privately. Not really the sort of thing you'd do if she was in someone else's care.
What they say about the contact is that 'Kenzey's Mum Maz will also be present'. But it didn't say why she would be present (could include bringing them with her) and didn't describe it as visitation for Maz. Just that she was 'present'.
The wording around it was so careful, no saying that Maz was having any sort of visitation, but not being explicit about why she was there etc I think she is.
According to Kenzey's social media Kenzey was involved in administering her medical treatment up to March that year. And her friends on social media claim she's already been out of prison to visit her in hospital at least once.
People do assume in cases like this that the children will be whisked away and never seen again but they do often stay with family. A boy from a very high profile case lives locally to me with his grandparents while his mother is in prison, but people online swear until they're blue in the face he's been adopted away.
I suspect Kenzey will have some sort of contact when she's let out.