The key is whether it is a term of endearment or derogatory. My wife used the term 30/40 years ago. The girls are going shopping today. The girls are getting together this afternoon. Our daughters use it to describe their friends. The south side girls. It was the same back in the 50s and 60s. My sisters would ask if I wanted to be one of the girls. I always said yes.
The same with boy. Older guys often call younger guys, boy. Hey boy you better catch that calf ...
I'm not a fan of gurl or some of the other terms used to refer to CDs or TGs, but that is just my preference. I see women using girl on tv shows. Especially some of the housewive shows.
