Mine couldn't do a 7-7 routine until he had dropped the nap at 2.5yo. He could never do longer than 10.5 to 11hr night (ok he did a few 12 and 13hr nights when we dropped from 2 naps to 1 but that was temporary). Some LOs just can't do a 12hr night.
In the main I'd suggest you try to keep night sleep the length it has always been, so if she's used to doing 11.5 hr nights then stick with that. It may move longer or shorter as routine and needs change. I just know that no matter what I did with DS he could not, would not, sleep at 12hr night, had I not accepted this I would have driven myself batty at trying to achieve the perfect 7-7.