Okay squeaky - but your post is a bit confusing, to me anyway. You seem to be saying 'yes she is but she needs society's help'.. though I am clearly misreading.
I think, in the end, that 'evil' implies two things.
Firstly, that this person's capacity to make a moral choice has not been influenced by circumstance to any degree.
Secondly, that there can be no possibility of change or redemption.
Both these go against the teaching of the Christian Church.
I like what your Telegaph priest said: "wicked" is a good word to describe those who carry out dreadful acts which others, in the same situation, do not make.
At the same time it does not absolutely deny the possibility that the person has a moral sense which has been warped by circumstance; nor does it shut out the possibility of repentance and redemption.
It seems to me that those two ideas are fundamental to an idea of "human-ness" that most of us agree on. And one of the reasons that I dislike the term 'evil' is that it removes the humanity of a person. At which point it becomes far easier for us to become inhuman in our treatment of them.