In my opinion, when it comes to parents/children relationships in Disney movies, it’s usually pretty straight forward. The people a child (or in this movie, cub) refers to as "mother" or "father" usually is their mother or father.
I honestly don’t see a reason why we shouldn’t believe that Zira is Vitani’s mother. Nuka, Vitani and Kovu are all shown as Ziras cubs, so that must be the case. I don’t think the animators makes it any more complicated than that.
For example, why should be believe that another lioness is Nalas mother when she refers to Sarafina as "Mum"?
Just my opinion. And another thing, if Nala WAS Vitanis mother, who would her father be? Vitani looks nothing like Nala, more like Scar and Zira. It’s far more likely that she’s Scar and Zira’s daughter, or perhaps the daughter of Zira and a rogue, which would explain her orange fur and blue eyes, which couldn’t originate from Nala, Scar or Zira.

the animators are not trying to deceive us.















