It's good to give a traumatized child a loving home.
Mary has been approved to be a foster parent and can foster children when she is ready.
Mary wants to decide if she is ready.
Mary thinks of everything the children have probably been through and decides to open up her house and heart to foster children.
Mary worries about the backgrounds of children she would foster and decides she will not accept any of them afterall.
The children Mary fosters have a stable home for the first time in their lives.
The children Mary would have provided a home to have to remain in an overcrowded group home.