A.G.
Did your daughter just recently start walking? If so, you've got a little one with wanderlust! She wants to get up and walk and play because now she has become a lot more independent and she wants to use that independence - even if it means waking up at 2 AM to play!
When my daughter did this, we started putting things in her bed to play with for those times when she wakes up - books, stuffed animals, Little People, things that she couldn't choke on or that wouldn't harm her if she played with them. This would keep her busy for a while until she would start crying and fall back to sleep.
You have already reinforced the crying behavior with getting her out of bed. She knows that you will come get her, so now she will continue to do it. If you let her cry it out, it may keep you and the other children in the home awake for a little while, but it would only be for a few days. Bad habits can be broken very quickly in little ones if you just have a little patience and wait it out for a few days.
Good luck!