P.
H.,
I have 4 children and they have all had different sleep patterns. I know it can be so frustrating when they start waking and you don't know why. I found sleeping through the night to be more of a 3 year old skill, than a baby milestone. You see, in my house, I have found that babies - toddlers wake up for absolutely anything going on in their environment. If your daughter is going through or about to go through a developmental milestone (pulling up, crawling, walking, etc.), the excitement/tension can wake her up. Bad dreams, definitely. But, this does seem young. Unless she has a highly sensitive temperament. My own children always woke up screaming when they were even a little bit constipated. A little mineral oil in juice before bed for a couple of nights works wonders for that and it's not addictive or harmful. Just don't use too much or she'll be pooping oil and that just looks gross. :) Good luck! Most of us mommies are wondering around in the middle of the night, too.
P.