And on Saturday, the children decided to surprise her with a party as they will all be at school today.
They wanted to show her just how much they love her and to give her a really happy day.
So they got together, in secret, to plan and rehearse a programme of items which would make her smile.
Since the Happy House opened nine years ago, Mama Sue has devoted her entire life to changing the lives of children.
With Papa Dave by her side, every step of the way, she has taken children from backgrounds destitution and despair, trauma or tragedy, abandonment or abuse and given them happiness, love, hope and opportunity.
Every child in her care now, or who has been in her care, loves and respects her.
As they go on through life they will hold her, forever, in their hearts.
Her birthday is a chance for the children to say thank you, to make her laugh and to see her having fun.
If anyone deserves to have a special day, it's our Mama Sue.
Happy birthday, Mama.
We will bring you video highlights of Mama's party over the next few days.
Today we have Mama's arrival, Evans introduction and songs from the boys choir.