The thing is cleft lip doesn't form in the middle of the upper lip AFAIK. Seeing as I have it (in b4 mutant) I've seen a lot of others with the defect, and in all my years I've never run across the condition like that.
In fact I doubt it's really even possible, because what's happening is the primary palate doesn't form correctly (assuming it's just a cleft lip). That's why you always see the pattern of the missing tissue extending towards/into the nostrils. Cleft palate is a different ballgame but this isn't /a/ - Deformities.
I think they were just trying to make her MOE :3