Mine didn't sleep through until much older. DS woke until 18 months+ (slept through on the odd night) and DD in the last 2/3 months really. He was still having a night feed until 1 year and we weaned her around 8.5 months - both refluxers which does change things a bit.
One night feed at 11 weeks is totally normal and if she is only waking once, feeding and going back to sleep you are all doing really well! STTN is as much developmental as anything and I really believe that while we can set good habits to encourage it they will only do it when they are ready.
Laura