Here is an easy trick to re-curling your American Girl doll's hair.
You will need:
A cup of water
a Q-tip
and a ton of small clips any kind will work. Here are a few I used.
After you gather everything together separate your dolls hair in to small or thick strands of hair.
Next get one strand of hair.
Then wet the hair with your water.
Then you will need to use your Q-tip and loosely curl the hair around it.
After the hair is curled around the Q-tip take your clip and slide it in the middle of the hair and clip it.
Then take the Q-tip out.
Continue to do this until you have done all the strands of hair.
Leave the clips in till the hair is dry then you can take them out. Your dolls hair should look like this.
Your dolls hair will no longer be frizzy but now curly. :)