After seeing this mans photo online who is currently serving a prison sentence for blackmailing thousands of victims online my daughter is sure she recognises him from a Sugar Daddy website. 
She was asked for images of herself by a man on there and told she would be paid after she sent them. He kept wanting more assuring he would pay. 
Then he asked for an image of her with someone younger like a younger sister.
She blocked him and thought no more of it.

Soon after indecent images of children were sent and received through her what’s app by the hacker and the blackmail began.

She never made a connection between the Sugar Daddy website and the blackmailer stalker who hacked her What’s App. 
It could be him or one of the men he trained blackmailing her as it was different numbers every time and the calls would disappear from her call history.
It could have easily been more than one person. She hopes it was him and is pleased justice has been done for many victims but also feels even more let down by the system.

 Police and her solicitor forensics I believe did not throughly investigate her What’s App for this blackmailer,stalker and hacker as she was told What’s App can’t be hacked.