Re: Too few feedings?......Too much sleep?
as long as her weight gain is good and her wet diapers are frequent enough (at least 6 per 24 hours), then just enjoy it, and know that it will also probably change in the next couple of months 
also do you get engorged when she goes that long? do you pump in the middle of the night?
it doesn't sound like she's sleeping more than other babies that age, just way more at night and less in naps.
DS 6/7/11 - Still night & morning nursing, but the rest of the time he just doesn't have time for me! After mostly working at home, gleefully packed away the pump at 11 months.
Another on the way in October 2013!