No, not correct. I've no idea how you got to that assertion, but it doesn't matter.
The family can see it. For sure. And, according to the OP, the changed behaviour when she was off the meds was obvious.
Even hiding/flushing the pills to make it seem like they are being taken, the behavioural change can still be seen easily, and then it's easy to talk to a doctor or the police. The doctor can visit and see for themselves. Or the police. Not easy/practical if living separately of course, but that is not the case here according to the OP. It seems that previously heads got buried in the sand when she was off the meds, or they though they could manage it themselves, and the family has paid for those mistakes dearly.
A very sad but wholly avoidable case.