Start with a rubber ball and cheap glove that's broken in. Play "Donkey" when playing catch. Mix in popups, catch with two hands. Play mini games with front toss. Homerun is over the backyard fence.. etc. Tee work is not necessary at this point.
While doing all this, take note of form. Is she stepping with the right foot when throwing? etc. Maybe video tape.
Did you play ball? If so you will pick up on areas needed for improvement. If not and you plan to instruct her, get educated.
Don't overcoach, let her try to figure it out. If she's asks for help or hits a roadblock, help her out.