I'm not actually very proficient at the piano myself, but I did learn when I was younger and although I didn't keep it up much, I know the basics.
Our plan is to teach her until I am in over my head, and then pass her on to Tammy to become amazing :) Like Tammy :)
I just wanted to write up what I do each week with her, for my own reference next time I'm teaching the piano to someone from scratch (like Ana, starting the first day of next year...) and so Tammy can come on and tell me if I'm doing stuff way wrong! :)
So Week 1:
Learnt that the notes correspond with letters A-G. Learned how to find middle C, and place both thumbs on middle C and the rest of the fingers on the other notes in basic piano position.
Learnt a basic scale just with the right hand - singing 1-2-3-4-5 as she went up. When she had mastered up, learnt down. Had some trouble and tears - said it was too hard. I got on and played some Disney songs she recognised (like, one handed lol) to show her how fun piano can be when you learn it, then sat with her to have another go, and helped place her fingers a few times. By the end of the lesson she got it, and was very excitedly playing her 1-2-3-4-5-4-3-2-1 over and over. If she masters it this week I plan on teaching her to do it with her left hand next lesson, and start introducing the notes on paper afterwards.