Yeah, when she's acting witty as Alayne it's because she actually is witty, when she's acting vivacious and brave it's because she is, as Sansa, as Alayne or whatever she chose her name to be.

I think she will not abandon her Alayne persona but absorb it into "Sansa", because... while it's a common hope readers have for Sansa, I really don't believe that she will ever become a good ole wholesome traditional Stark ala "the man who passes the sentence should swing the sword", and I don't think that this happening would even be good, neither for her nor for the story.

Sansa has always loved songs, legends, chivalry, courts and court etiquette, courtesy and eloquent language, the Faith of the Seven, the finer things in life, etc, things that are atypical for a Northerner perhaps but not really negative at all, and she shouldn't abandon those passions and become the new Maege Mormont, now being all about family and chopping up people's heads left and right.

Not dreaming of better things anymore but wanting to stay shut and isolated from the world in Winterfell like seeming show Sansa does (though her situation is vastly more understandable for such a sentiment). That's not progress but regression.

And a long story as well... so, yeah imo she won't abandon neither her appreciation of the southern and "Andal" life nor the lessons LF has taught her, she will integrate them and instead of changing herself to be more like the North she might change the North to be more like her, to make it a stronger competitor in the race, they have to change and improve if they don't want to lose any more Neds and rebellions.