Supposedly that same role was specifically looking for a non-white actress, and assuming that’s true, then that would definitely rule out Clarke playing the same character.
However, what’s unclear is if she’s playing the same “female lead” character that’s been discussed over the last few months.
A few weeks back, Tessa Thompson, Naomi Scott and Zoe Kravitz were reportedly the frontrunners for that role.
Lucasfilm loves to keep details regarding their upcoming productions locked tight for as long as possible, so it may be a while before we learn official details about Clarke’s character.