That’s Vanessa Williams, as the voice of ‘Ms. Brown’.
Here is Arielle in a Garnier commercial with the great Tina Fey:
A2: Sonita Henry (brunette)
Sonita is an actress originally from England. She has been in numerous TV commercials, as well as TV shows, and movies like “The Fifth Element” and “Star Trek”. This is Sonita’s official website and IMDb.
Here’s an interview Sonita did with Alternative Magazine Online.