The CRB check is designed to see if you're a risk to vulnerable people. There's a lot worse they could have been guilty of than fraud. I reckon it's worth declaring it, how long ago was it and what was their punishment? If it's an english disclosure anything she's ever done will show up on it apart from parking tickets i think. I was surprised when I got an english one back to find 2 breach of the peace charges and a vandalism charge on mine even though they were all dropped at a childrens panel I'd gone to because it was my step dad that called the police and it was down to terrible parenting that I'd done them in the first place, basically got picked up and thrown out onto the street without anything on my feet in the middle of a November storm so retaliated. I'm still able to work with young people but I don't know what ramifications fraud would have, best to be honest though.