I have no good way of assessing what the likelihood is that her claims are true.
If you actually look at the totality of her claims, there are probably more reasons to be skeptical than to accept her words unconditionally. About the only thing you can say for sure is that something really unfortunate is either happening to her now, or has happened in her past, for which she is unlikely to bear all the responsibility.
We don't have to take everything potential victims say as fact and immediately act on it, but remaining open to the idea that those in power may be at fault, and not disregarding victims accusations goes a long way in supporting them.
I would go as far as to say we completely underestimate what children understand and remember because we're the ones that chose to forget.
Conceivably the first part could happen without the second.
Frankly, I don't think we should ever give any credence to allegations that have absolutely no evidence. The road is too rocky. Most people have at least one person that dislikes them. The people that kind of attitude would affect generally have many. All it takes is one person willing to lie .