Casting error

Personally, i saw basically nothing wrong with the movie except for one thing. I enjoyed all of the actors, except one (Viola Davis) portraying fantasia's mother in the film. I was really turned off to the fact that they chose an actress whose voice was dubbed for the film and who looks nothing like fantasia's actual mom in real life. If the decision was left up to me, i would have chosen the actress Tichina Arnold. She sings, and plus she looks very similar to fantasia's mom.