Danielle, I was at Incirlik from 2003-2005 (Cable Dawg). Pick Turkey over Osan any-day. I'm sure you will not be the only girl there.
As for tour lengths, its 15-months single or 24-months married and most likely get a chance to extend if you want. Good place to save some money. Turkey has a ton of things to-do. Just look in the base paper or stop by outdoor recreation. Don't just stay on base and let time pass by. I suggest signing up for weekend trips. It’s an adventure just waiting for you.
Dorms are not bad at all. Driving is a little crazy, maddening and heart pounding at times; I miss it. lol :)
For eating, your body will take some time to adjust to off-base food and I would not eat salad in the summer. Don't drink the water off base, unless bottled. On base is just fine. They will tell you all of this and more.
Shopping is plentiful and everything can be bartered for. If you go to Incrilik, take a class on Turkish speaking, it will help allot. Weather is warm 9-months out of the year and wet the other 3. Only thing I disliked was locals bugging you for money and seeing some people living in poverty but we have the same in the US. Good luck with whatever you decide. Post an update back with your choice.
Henry