Welcome to the forum!
Bella is so beautiful! I was just about to name my little one Bella but my sister decided on that name for her pet so I had to choose another.
It sure sounds like you're doing all the right things and taking excellent care of her....HPW, fruits, veggies, cleaning, playing, etc.
I've heard the same thing about cracked fur and that it could be caused by humidity. Also, weather changes. Is she drinking enough water?
It's not uncommon for gliders to change color, like between gray and brown. Not sure why, although someone said it happens as they mature.
Enjoy your sweet babies!