Absolutely. But she isn't accused of child rape, she is accused of exercising terrible judgement which is also very bad PR for Reddit involving employing a subsequently convicted child rapist who happened to be her father, apparently in the belief he was not dangerous and also standing by her partner after his very offensive erotica was revealed. (of course it's possible to argue that this raises very serious concerns about her ability to identify and deal with dangerous behaviour and possibly even sympathies for it, but the same goes for certain kinds of offensive speech)

Yes, but that's not really the relevant thing.

People get "cancelled" when a large enough group of people think someone has done something wrong.

It just happens to be the case here that the group is very large, but it's fundamentally no different to other cases where people have been "cancelled".