Hopefully she will remember the pie with nostalgia tinted glasses and not keep in mind the shoddy latticework :) This and this was very helpful, it kept me from tearing my hair out in frustration.
For the dough
2 cups all purpose flour
2-3 tablespoons cold water
1 teaspoons salt
1 stick butter
1/2 teaspoon baking powder
1/4 teaspoon baking soda
For the filling
3-4 apples, sliced, depending on the size of the apples
1/2 cup sugar, adjust to liking and sweetness of the fruits
1 cup cherries, chopped
1/2 teaspoon cinnamon powder
1 teaspoon vanilla essence
3 teaspoons orange juice
1 tablespoon flour
Sift the dry ingredients for the dough just like you would for cake. The add the butter and mix together, it doesn't have to be smooth dough at this point. Then add the cold water and knead till it becomes smooth and pliable. Cover with cling wrap and keep in the fridge till you make the filling.
For the filling, mix everything except the flour. Cover and keep till juices start flowing (about 10-15 mins).
Divide the dough into two parts. Roll out the first part to the shape of your pie plate, a little bigger than that.
Add flour to the filling, toss once and pour into the pie crust.
Make the lattice(watch the video for instructions, its too much work to write) and seal the edges together. If your strips break, like mine did, just seal them together with water. Once its done, its hardly noticeable.
Brush with egg wash and bake for 30-40 mins in a 350 degree oven. I had to do the baking in two parts since I was taking it over to Navya's. So I baked it for 15 mins and then wrapped it in foil and baked it for 15-20 again at her house. So this is not an accurate measure of time. I just kept looking till the crust turned brown and I could smell the pie.
The above mentioned sources have way better tips. So if you have read this till this point, well, too bad for you! :)