My son tried similar. I had enough one night and he went to bed at what I told him was a civilized hour.
He cried .. he was upset... he'd eventually tire himself out.. after about a week he fell into routine and slept fine at the earlier hour. I just taught him you don't get out of bed.. and that once I put you down I will not come back in for every cry and whim. I would peek in carefully so he couldn't see me.. and let him work till he slept. When I checked the clock iot was aq LOT less then I thought it was.
It was hard. I am a very crunchy mom too... I did co-sleeping for a long time.. sling wearing.. etc etc... but.. there does come a time... and for me it came. At first when he'd fall asleep I'd use an hour or two to myself and bring him in bed with me and then I'd stop that slowly.. but I had my reasons.
On the other hand.. if it doesn't bother you... then it's not a bad thing. Some familes keep different hours. The only issue is when they start school and helping them learn that new routine in the two months before school starts their first year. If you plan to homeschool this is also not a real concern.. some kids learn better at different hours...
So really it's a matter of what you feel is important and your priorities for it.. if it isn't a huge issue.. then it isn't a problem right now.
Maybe start inching her back 20 minutes at a time instead of hours.. or half an hour at a time.. for a few nights to a week.. let her sleep at 10:30 instead of 11 and just keep inching her back...
Start a chart... tell her she now goes to bed an hour earlier and every night she does so without a big production she gets a star.. 5 stars mean this... and the week after she will sleep at this hour..a nd if she doesnt' throw a battle.. she will get this.. make each week a fun reward for doing better and better...
I know a lot of moms I talk to say the same things though, that around that age kids do that. My son was up till then about 3 months straight before I had enough of it.
So decide if it's really an issue, if it is, then I hope one of my suggestions helps and works! Good luck!!