I don't see an immediate concern. My bulldog who just passed was a big, beautiful 78 pounds at full size and weighed around 60 pounds at 8 months. Now, he was a male, so they are larger but you want to see a taper around your bully's waist and no belly. It's really key to make sure she is staying fit because, with all the problems these babies tend to have, extra weight exacerbates all of them.
I feed my bullies grain free and I think it's a great option to control allergies and keep them trim.
I love her name (we called my first bully Booba by nickname though his real name was Bentely), and she's just a beautiful girl!