I don't think this is her:
https://www.ancestry.com/sharing/9536815?mark=7b22746f6b656e223a226...
but in 1870 there is a Mattie Jenkins in a census for "ORPHAN ASYLUM"
here
https://www.ancestry.com/discoveryui-content/view/12086872:7163
https://www.ancestry.com/sharing/9537046?mark=7b22746f6b656e223a227...
https://www.ancestry.com/sharing/9537046?mark=7b22746f6b656e223a227...