Honestly, it sounds like things are going GREAT for 5 weeks! Some babies don't take a df--we used to have problems waking dd some nights too. You could just stick with the current schedule you have and figure she will slowly lengthen her asleep time (if you are lucky
)
If you really want to keep trying, maybe try a little earlier-- I think it can depend on what stage of sleep they are in. Maybe at 11, she is in a deep sleep, but if you caught her at 10:30, she might be more receptive.
HTH
~Kim