I don't have much advice because my baby (who's younger than yours anyway) sleeps in my bed with me and has so far had no problems sleeping, but I think that leaving a baby to cry makes it worse. Babies can get anxious, because they don't know if you'll attend to them if they cry. If you go in and comfort her right away, she'll soon learn that you're there if she needs you and will drop off more easily. That's my opinion anyway.