Yes, we had a girl who competed against boys in Level 4 and 5 (not on our team) . She wore the boys uniform and did the same routines. Her hair was in a very short bun thing (like several of the boys as well). Thought she was a boy until the announced awards, and her name was something unambiguously female like Isabelle. Didn't see her after Level 5.
I think eventually, the girls would have trouble with the strength events like rings and pommel, although their floor and vault skills seem to be the same as the boys. I can't imagine the boys being able to do beam. In Level 5, the boys had to learn some sort of kick/twist/land in an arabesque move. and none of them could do it well for a while. I asked my son why it was so hard and he said "You try it" and I could do it right away. I think PBars, the girls would be fine on,