Emma, with your routine I think what you'll basically want to do is move everything forward in 15 min increments. I wouldn't want to mess with her mornings too much since she's getting that great sleep, but I was wondering if you could feed the breakfast somewhere between her morning bottle and first nap. Then, you could have a bottle at 10:45, then moving toward 11. Then, after her second nap, start moving that next bottle forward by 15 mins every few days until you reach a 3:00 bottle time.
Of course, these are all just suggestions if you are trying to find ways to tweak her routine to a 4 hrly schedule. However, if things are going smoothly, I'd really just suggest you let her be the guide.