My grandchild is six months old. She was left in my care at 7 weeks old. Can I get guardianship?

You may be able to be appointed the child's guardian. There are several issues a Court would consider. Are the biological parents available? Are you an appropriate guardian? Do any of the adult parties have a felony record, etc.? You must be qualified and appropriate to serve as guardian. Ultimately, it is a question of what is in the best interest of the minor.