She seems to be alone a lot of the time. I think everyone keeps her at arms length. She fell out with her brother years ago didn’t she.
It's never clear. Her family have, to my mind, been incredibly patient in not publicly refuting some of the things she's implied about them.
I suspect they have challenged privately because in recent years she's been at pains to point out how supportive and involved her parents and the child's dad are (though she still implies she's the primary carer), so it seems pretty clear they haven't gone NC.
I don't know about the brother but I remember her saying that her mum and dad saw her at least every week when the child was younger.
It's certainly true she seems desperate for attention but it's worth remembering that attention is how she makes money. She may isolate herself, IDK, but she doesn't lack a support network in the usual sense.