If you are concerned as i see you are, and I don't know what to think about what it could be, a suggestion is video tape her and what she does, like her "trances" this might help the doctors better.
I was told by my son's doctor to do this so they could see how he breathes and things, well I didn't have a camcorder and so it took a little longer to get the answers but keep going if you are concerned.
Good luck
michelle
The excessive urinating could be from drinking fluids does she have a lot of drinks during the day although you say she doesnt drink a lot, ,have you still got her on a bottle as they do drink more ,if this is the case change it to a sippy cup, and let her have plenty of drinks, water etc during ,the day,the drooling is probably from teething and is normal they do drool a lot when cutting teeth. Do you give her finger foods to eat herself as children respond better at this age feeding themselves than being spoon fed.Perhaps she sleeps because she is bored so play games with her , read stories, music, Fun, you may find if she is more stimulated the staring into space may lessen .Good Luck