On the one hand, part of me thinks, take the twelve hours! My firstborn was a terrible sleeper and after that experience, sleep trumped all other concerns in our household.
However, one thing about said firstborn that I wish I’d had the experience to figure out sooner was that part of the reason he didn’t sleep was because he was very easily overstimulated. He had a very short window between fine and cranky, and if we missed it, sucked to be us. There were no cues. What we needed to do was not wait for cues, but we had no idea what we were doing. If she’s resisting, maybe try a bit earlier in the schedule, before she gets cranky?
Also, it’s worth checking with the doctor to see if they’d be worried about the 12 hour thing. If she’s eating well and staying on her charts, the doc may also tell you to enjoy your good sleeper.