Just wondering where you are feeding her? Is it light and bright and stimulating or dark and quiet? I know with DS keeping it dark and quiet and keeping him wrapped at night feeds helped to give him the message it was 'big' sleep time and not just a nap.

I do remember though that many babes go through a very unsettled phase at about 6 weeks. Could your partner take turns staying up with her for a few hours while you get a bit of sleep in before the 10 pm feed?