You are fortunate your baby has a great routine and is pretty stable in her sleeping for now.
MOST babies/kids wake up early.... then, as a human being gets older, they tend to sleep in later. Tis' the way it is.
I remember waking up even before 6:30, when I was a kid.
All my friends kids, and mine included, all have their own wake up time/cycle.... and it generally is at about 6:00-6:30 that they wake up. For me, if that is the time a child naturally wakes up, then let it be.
Then, about 9:00am, should be her nap time.
Babies/kids this young of an age, get tired about 2-3 hours after waking.
For my kids, they have a regular nap and bedtime time/schedule. BUT, sometimes they go to bed earlier or later... but no matter what, they ALWAYS seem to wake up at the same time in the morning. Like a clock. Its just the way they are. Making a child go to bed later... does NOT automatically mean the child will wake up later the next morning. Didn't happen with my kids. My kids still wake up at their regular time no matter what.
I would think long term... because right now, your baby seems to be a REAL good sleeper.... it is just that you don't like that she wakes up early. But what is 30-45 more minutes? Its not much.
Next, messing with a child's sleep schedule, can often just create more problems and then throw off their good sleep habits.
Next, she actually has a real great sleep pattern... and later, when she starts preschool she will naturally wake up at a good time, in order for you all to get to school/work/appointments on time.
It's up to you... but what a great sleeper she is already and she can self-soothe.... which is what all Moms hope for!
My son upon waking, is very good too... even though he is an early riser (6-6:30am), he can and will all on his own, just entertain himself quietly in his crib even up to an hour... or I take him out and he will lay next to me. And then later at mid-morning he takes his nap. So, your daughter is doing real great...
All the best,
Susan