Little Miss Early Bird

I do not know whats up with her, for shes been waking up earlier n earlier each day.
She normally wakes up at around 9am, and been waking up at 830am of late. Fine, 830am or 9am not too much of a diff.
Slowly it went to 8am.
Then 7 plus plus am.
Then 7 am
Sunday morning it was 651am.
This morning, it was 451am!!!!!!!!!!!

What is wrong? Each time, she is wide awake and on her tummy, playing with her toys when I popped over to her room.
Are those signs of teething?