So what do you do?

Lately, Mary's been waking up earlier and earlier. This morning it was 4:35am! That's way too early. I decided to try to let her work it out and see if she could fall back asleep. The crying just kept getting louder and louder..."mommy, mommy, sob, mommy." Doug said "it isn't working" i.e. get up and stop the crying I'm trying to sleep. Groan. Mary quiets down the second I pick her up. A couple weeks ago if she woke up early like this, I just crawled into her bed with her and fell back asleep. That worked. She was happy and I was happy...and semi comfortable. We even slept together at the hotel this past weekend since there were only 2 twin beds in the room. I don't want it to become a habit. I kept trying to put her back down in bed without me and she would start crying again. I finally told her that she need to stop crying and use her words. "Tell me what's wrong?" "Water", she replied. Ok, I can do water. I put her back in bed and got her the water. She wanted her book that she always sleeps with. I handed her the book. I pulled the covers up, she looked at me and said, "bye". Was it that easy? Slept until 6:30am. Thank you.