Yes fumbling all the time, and if they are serious what they need to do is the little kid stuff and carry a football around with then 24/7. Spin it toss it bounce it kick it and throw it out in front of themselves everywhere they go. Eat with it sleep with it.
Have to improve the first grab percentage. Get control of it and send it forward - preferably to a free team mate. There is no time to fumble and/or take your time to get control of the ball.
I think that will be a big difference when girls can play footy all the way through growing up. So many AFLW players from other sports and they take a while to get the ball handling skills and the ability to read the game.
That said, doing the little kid stuff would do nothing if not help. I have barely picked up a footy in years but when my daughter started playing pub footy I went for a kick with her - I can bounce, I can kick, my ball drop is not too bad - all because as a kid I used to play kick to kick with mates, only ever played at Primary School and was crap anyway, but still a few basic skills from just handling a footy as a kid.
DS