That actually why I think the series (should it ever happen) might want to plan on a re-caste. Lea was very different pre and post Cure, and I find myself picturing the later, crazier one as younger, whereas the early Lea was a slightly more mature Godmotherly type. Most of that is Harry's perspective changing her from a childhood nightmare to more or less another damn Fae to have to deal with, but something more of an equal.
I dunno. To me it almost seemed exactly backwards from that. I always pictured the original Lea as super energetic, mood swingy, young, and beautiful. She always seemed to have an agenda, and she didn't always seem to have Harry best interest in mind (Because his Bargain).
Later on though, she seemed more godmotherly to me. After her debt with Harry was finished, she only had his mother's bargain left to protect him. She became very godmotherly, and very helpful. More helpful even than I think the old Lea ever let herself be. (Not including Changes when she was allowed to indulge).
And as time passes, Harry really seems to warm up to her. He hated her for a long time, but he begins to respect her and her advice. When Mab imprisoned Lea Harry got pretty stubbornly defensive about it (She was a b**** but she was MY Godmother). He gets mad about the way she trained Molly, *But* he acknolwdges a lot of her reasons for doing so. (I.E. she hadn't learned she needed to work with more than illusions.)
My ideal Lea would be a young redhead, that could gracefully age into a middle-age redhead by the end of the series. While the fae don't age, they tend to look how they want. As time moves on, she seemed to fit more into the "Godmother with Godsons best interest in mind" category.