Here's a link for you:
http://www.babycenter.com/0_how-much-sleep-does-your-chil...
At this age, to me, yes, her morning nap can be later, and/or turned into 1 nap/day. At that age, my son was napping at about 9:00 or 9:30am. And then again at about 2:30pm. Whereas when he was an infant, he napped earlier at that 8:30am timing. And like your child, my son wakes up for the day at about 6:30-7:00am. He goes to bed at night at 8:00pm.
BUT, the caveat will be, if you do turn it into 1 nap a day (before she is ready for that)... she WILL have days that she DOES need those 2 naps a day, still. And if you completely forfeit the 2 naps for 1 nap... she may not transition to it that well. Or she might.
Typically, a baby/child will get tired after about 2-3 hours of 'awake' time. That is how you can gauge it. If you miss this window, then the child gets "over-tired" and then putting them to nap/sleep gets arduous and harder as they will "SEEM" to be not tired, but actually are....and then they get fussier/grumpier and then will fight sleeping/napping. BUT it is because they are over-tired. OVER-tired babies/kids, actually get more 'hyper' and have a HARDER time to fall asleep and wake more.
But also at this age, they are having a sense of self... and independence, hence the 'protesting' at their usual routines. But, just keep consistent. Its a phase and will go back to normalcy. They need to know their routines. And even through this nap aberration... which is typical at certain age junctures, it WILL get back to normalcy if you keep a staid consistent routine about it.
To me, bedtime at the 6:30-7:00pm time slot, is a tad too early. Try putting her to bed maybe at 7:30pm instead. But keep her naps as usual... .SINCE she IS taking her naps well, and routinely as usual. It is her rhythm right now and she is still doing that. If you mess with her nap times too much, or too rapidly... it will get messed up. And that won't be fun. Because the child will get irregular about it, when it didn't have to be messed with.
*In your daughter's case... I personally feel she still needs the 2 naps a day, since she does well with that and does go to nap at those times. Still.
But just adjust her bedtime. Later.
Just my take on it. My kids, nap regularly everyday. My eldest child was still napping until about 5.5 years old. My son, who is now 3 years old, still naps everyday... at about 12:00. I don't force it. But, I have a regular consistent routine about it. When my kids are tired, they know to nap. My son will even get himself in his nap/bed routine by himself now just by verbally cuing him, when I say "nap soon, lets get ready..."
Just my thoughts,
All the best,
Susan