Not to over-analyze your use of language, but using the possessive here makes it seem like she personally owned that phrase or its use was associated with her. First, I don't know if that's true. Did she say, "Ooh la la," constantly, or is it just something she said at the beginning of the music video (and possibly studio recording) of the one hit from Deee-Lite, Groove Is In The Heart? Moreover, that phrase is a fairly well-known and widely-used one, see: https://en.wikipedia.org/wiki/Ooh_La_La. It certainly was not original to her nor would its use indicate an association to her. To your point, its use plus the aesthetic of the character does seem like a reference to Lady Miss Kier's appearance in that music video (if not also her style and appearance more generally, I don't know if that is how she always looks). But she didn't sue everyone else on this list for the use of her supposed catch phrase, ooh la la.
I hate to say one person's fame is so great that they get special or different treatment in court, but I think "Lady Miss Kier" was punching above her weight in trying to sue over use of her image. Her fame was a flash-in-the-pan one-hit-wonder in the early 90s, no offense to any Deee-Lite fans. It was certainly a great song (with some help from Herbie Hancock, Bootsy Collins, and Q-Tip).
Prompted by your comment I read up about the case and from what I understand Sega wanted to use the song in a promotion and not (what I remembered) her likeness.