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I know the feeling, Leyton, but I am sure you will manage. I took on Sirius' care when I was far younger than you are now.
If it's a magical control issue, I may be able to help. I haven't the feminine sensibilities of a governess, so you may well decline on those grounds, but I am not afraid of the uncontrolled magic of children. I can teach her that, if it's possible, or else arithmancy, magical theory and natural history along with my Sirius, if she is up to it.
By Slytherin's ghost, don't give the child open access to all the sordid correspondence here. You can set limits. I will show you.