P.P.
Your daughter is going to go through periods of either sleeping though the night or frequently waking up. Its natural. Teeth pain, growing pains, hunger, fear... lots of things will affect her sleep. You need to do whatever you need to in order to cope. If you can handle letting her cry herself out and that's what you want to do, then that's what you should do. I could never do that. The couple of times I tried, my kids threw up all over themselves and the bed so it took even longer to get them settled down and cleaned up. So I was one of those moms who, (horror to many I'm sure), picked up her child and soothed him before putting him back down to sleep. I sometimes even went to the rocking chair and rocked him back to sleep. It was important to me that my sons knew that I would be there when they needed someone, no matter what time of night it was. We also did a family bed for the first 9 months of both of our sons' lives. We then moved them to a crib in our room and then finally to their own room. But that's what worked for us. I'm not telling you it will work for you.
The only advice I feel comfortable giving is to hang in there, do what you feel you need to, and just accept that your child will sleep through the night consistently at some point. People are going to have lots of advice for you, but that is just their opinions. Whether you have a child who sleeps perfectly through the night from day one or a child who is up all the time is not a reflection of your abilities as a parent.
How often do you read a post on Mamasource from a mom to a 5 year old at her wits end because he won't sleep? Your daughter will sleep through the night. Before you know it, you're going to be up all night worrying about her because she's out on a date. You can't make your baby sleep. All you can do is create an environment that is conducive to sleeping and then control your own behavior related to your baby's sleeping or not sleepying (and crying.)
When I was struggling during the first year of my first son's life, (a lot having to do with being sleep deprived), my father looked at me and said, "You'll sleep plenty when you're dead. I still have nights where I'm up at night worrying about you kids even though you are all grown." Very true.
One more thing... both of my kids sleep through the night consistently now. But deep down, I miss those 2 am snuggles in the rocking chair with their warm little bodies in my arms, listening to the relaxed deep breathing. Because now, neither of them will sit still long enough to let me snuggle with them for long.