Quoting bekahjade:" sometimes she is hungry, sometimsshejustwants herbottle tosootheherselfback to sleep,andsometimes,shejustisnt ... [snip!] ... tiredanymore.like she will just stand in her crib and cry until someone comes andtakes herout so shecan play"
Don't play with her at night. If you do it a lot, she's probably associating nighttime with playtime, which you don't want. When you go in with her at night, keep all of the lights off, don't smile or play with her at all. Give her a bottle or just rock her until she falls back to sleep.
Have you tried to put her to bed earlier? I know on nights that my son gets to bed late (he's normally in bed between 7:30-8:00) that he wakes up earlier for the day and is just less rested.
That being said, DS still wakes up at least once a night to nurse. He's 10 months old.