Maybe keep her up an extra yr later so she wakes up with the other kiddo's?
Wait til she starts walking she'll be out for you w/ no waking up.
Maybe she needs a little more stimulation so she sleep through.
I have one little guy who takes a 2 hr nap and the rest 3 hrs. That last hr we spend time reading or puzzles, or a quiet activity. Sometimes I will even put in a movie for him to watch so he is quiet for the other kids. I had a infant here last week who slept a 1 1/2 all day.
She was 2 1/2 months. She was a very good baby who hardly cried but I understand. Nap time is important for us to eat and get our stuff done for the day.