You know, the more I think about it, the more I think Lwaxana is one of those absolutely brilliant people who are so intelligent they just play dumb or airheaded because they have literally nothing to prove (see also: O'Neil on SG-1 or Paris over on VOY). She is probably an extremely talented telepath, as Deanna alludes to. She is just so aware of the absurdity of existence and individual identity that she has trouble taking anything seriously.
She's also quite useful to have in your corner. She casually prevented a terrorist bombing at that conference and barely acknowledged the fact that she probably saved dozens or hundreds of lives. She was willing to possibly sacrifice herself to that daimon to save Will and Deanna. She looks after her friends and family almost aggressively. She's actually pretty damn noble.
She's also quite useful to have in your corner. She casually prevented a terrorist bombing at that conference and barely acknowledged the fact that she probably saved dozens or hundreds of lives. She was willing to possibly sacrifice herself to that daimon to save Will and Deanna. She looks after her friends and family almost aggressively. She's actually pretty damn noble.