no, we don't teach matlab. maybe we'll add that in the future.
for now, I think she'd just get a lot out of learning some of the fundamentals of programming rather than diving straight into matlab.
having a grasp of some of the basics will only help her understanding of matlab, and I'd even recommend trying to work on it concurrently.
If she gets started on CodeHS, I guarantee she'll learn a lot and have fun in the process.