As of the date of this question Abigail Breslin is 13 years old.
In the US some girls of this age do enter the rite of passage into womanhood and start shaving their lower legs.
Being a star she very well "may" have had her legs waxed by now but this information is unconfirmed. I did find several pictures of her in the Google image search showing her wearing open toe shoes. Her toe nails are painted red so I am going to venture a guess that she probably had her lower legs waxed, or used a hair removal product.
I will ask the question on her fan site and see if she gets back to us.