I wonder if maybe Jennifer doesn't realize her voice always drops an octave in all her roles unless it's a sweet kind of sensual moment then her voice gets light.. Bette Porter used that deep octave often especially when it's a dramatic or serious scene.
*Producers mindset for picking Jennifer Beals: Let's copy scandal, a powerful female Black lead but also cater to white demo. Jennifer is half black so they got all the checkboxes*
Or maybe, she's a skilled actress with almost 40 years worth of acting under her belt whose won multiple awards and nominations and the producers gave her the role based on her skills rather than ticking off identity boxes?