This only applies to Apple products...
If you open "settings" and click on "general" and then "keyboard" you can go to the bottom and open the tab that says "add new shortcut"
Now type any common word for the "shortcut" and anything ridiculous for the "phrase"
Now whenever she types "car" it will autocorrect to "potato"
And the best part is, you only need to infiltrate one device and it will affect all of them with the same AppleID