If a 13 year old is dating a 22 year old and the mother gives consent for them to date can anyone press charges against them or can anything be done to stop this?

Yes. A mother needs to be a good role model for her children. She is responsible for them and what they do, and teaches them right from wrong supposedly. If the mother is not doing her job of mothering her child then she is liable to some sort of retribution from the authorities if her child comes to harm in whatever way. Obviously a child of 13 is very young still and vulnerable to predators. They do not need their own parents passing them over. They are in need of good parenting.

I would inform the child social services department about this and tell them why you are worried for the child. The age gap is too wide. I just hope that no sexual relationship has begun between them as this would be a very serious offense indeed and an imprisonable one for the adult who interferes with the minor. This would be seen as pedophile behaviour. The mother would be in serious trouble also for allowing it.