I haven't seen any comments about her skin colour or her weight but that's obviously dreadful and unacceptable.
The only comments I've seen have been focused how she has behaved rather than what she looks like and I think it's justified. She was essentially trying to gaslight the campmates and audience into believing that Fred said something that he did not. Luckily it's all recorded as a PP said.
I thought her behaviour on last night's episode was toxic. We need to be calling people out when we see this sort of behaviour. It is not acceptable to weaponise your trauma to paint someone else as being in the wrong and yourself as being a victim when that isn't the reality. She behaved really, really badly.