I'm a Weissbluth fan too, and we also went through this as well. We would stay in bed and just listen to see what was going on. Most of the time he was just awake and playing a little bit. On rare occasions, he'd be crying. We never went to get him before 6:00 and most of the time he'd fall back asleep. If not, he would typically just play in his crib until we came to get him. When he did wake up early and not fall back asleep, we just moved the first nap up to (no earlier than) 8:30.
Try not going to her - chances are she doesn't need anything. It's not like she's an infant and oh my goodness you have to feed her NOW! You say she's content so why not try just letting her have some alone time in her crib. She may stay awake, she may fall asleep, but chances are she might start pushing her wake time later and later (that's exactly what happened with our son).
It sounds like you have a happy and healthy baby, so kudos to you for being a great parent and assisting her with the sleep schedule - I bet she's just a peach!