Anyone have any ideas what she might be?

Hi everyone, my kitty's name is Jenny and she's not even a year old, I found her in a garbage as a kitten and fell in love. She looks like a cat I used to have who was a tortoiseshell. It might be hard to tell but she has a lot of brown in her even though she looks black, the brown comes in more and more as she ages and she also has random white hairs, she also has a white spot on her tummy, any ideas? I appreciate any help.

She's beautiful I can't offer much help beyond DLH though. Black cats often have the odd stray white hair. The brown you talk about is most likely 'rusting' - when a black cat gets a brown tinge to its fur after sunbathing. It's like the sun has a minor bleaching effect. It happens to my black girl too.