My grandmother taught me how to move things on.
Again, you need to be VERY in touch w/what you sense, b/c if you sense anything you are uncomfortable with, you must leave it unless you are extremely experienced, even then, but not to go at it alone!
Either call in someone more professional and experienced, or leave it for a bit if you can.
That is what I did w/the mother. After a while, if I just let myself sense her, there was a great deal of sadness behind her anger. I just had to get past the fright and let her communicate.
But this was VERY hard, b/c part of it is that you're going to feel what they do, and this was a mother's loss of her 5-year-old son.
Her grief was little short of overwhelming. She was not allowed to time and space to grieve much over his death - it was about 1876, she was 23, and had other children. She had to buck up and hide and carry that sadness in her heart w/her all the days she was alive, that's what was expected of her.
Once someone could acknowledge how she felt, shed a tear for what she went through, she was ready to move on.