Little girl with curls, what to do.

What an awesome forum for me to find! I baby-sit a 6 year old who has long, blond ringlets. It's so cute, but extremely frizzy, gets tangled so much and seems out of control. Her mom isn't much of a help in taking care of it and the little girl loves to mess with her hair so causes it to get tangled and frizzed. What I would love is some tips/tricks/advise on how I can take care of her hair when she comes over or things to help tame the hair, etc. Thanks!