I liked how ITV News said she'd "broken her silence today" when she's been talking in the press and on Twitter for days on end now.
I don't actually think that the public in general need to know the specifics of the case, but I think it's fair to let her know what Venables has been charged with. There are already so many unique circumstances that I don't think one more would make a difference, and if it puts her mind at rest (though it's more likely to confirm her suspicions, than do that) then it'll be worth it.
The wider public don't need to know anything further IMO, not until after the trial. There's no reason for anyone to know what he looks like or to be informed of the specifics of his alleged offenses, other than to sate their nosiness. If and when he's had a fair trial, that is when the full details should be released.