well here in the uk it is now light by 5-530am, Its not getting dark till 7pm and this is getting later everyday due to summer, As it stands today there is more then 12 hours of light which means you wont get the full 12 hours dark needed to flower.

Also 3ft on a window sill, How..? Will you get light to your plant once you put it into flower and it ends up at 6-9ft... Have never seen a window that big in a house.

And your mom is going to put up with a tree growing/stinking out the house..?