A.M.
I'm in agreement with Cori - this is a busy time for your little one as she's learning more and more about her own mobility, her body, her person. All these things disrupt sleep and once she gets them down during the day her sleep will improve. Know too, at this time of her life, she's figuring out also more and more that she's a distinct person from mom.
The skills she's learning in being able to move around also means she's going to need more reassurance from you that you are still there - hence there's also a 'clinginess' associated with these milestones. Leaving her to cry will teach her, but it will teach her that you are not there for her, that she is left on her own, that she is abandoned, and her cries don't matter. She may respond by either becoming withdrawn from you, angry, or even clingier during the day. Your sleep is disrupted for now, but stick with her, continue to comfort her as she works through these stages and you'll help her to become a confidant, independent person. Two favorite books that have helped me are "No Cry Sleep Solution" by Elizabeth Pantly and "The Sleep Book" by Dr. Sears. Both are available for cheap from Amazon. Good luck! This is a phase, and it will pass. You will get better sleep soon ... until the next phase!