M.K.
It might work, you'll just have to try if this is what you really want to do.
My understanding is that breast milk only keeps for three months unless you have a deep freezer (in which case it does keep for six months), so if you want her drinking pumped milk until she is a year, that means you would need to keep pumping at least until she is nine months old.
If you stop pumping now, you might end up being really engorged during the day and then see your milk supply drop off completely with only one feeding every 24 hours. I do know that women who are cutting out one feeding session at a time (in an effort to wean gently) sometimes see their milk supply die out completely before they were expecting it to, while others are able to drop gradually down to a single feeding without having that happen.
Good luck figuring out what to do!