An unidentified source identifies this woman as Mrs. Claus, wife of Santa Claus.
A bit of background on Claus, according to the Christmas special "Santa Claus is Comin' to Town," her name is Jessica, and is a schoolteacher in Sombertown. Elves at SantaClaus.com add that her middle name is Mary. But little more is known about this woman who prefers to live a quiet life, out of the spotlight of her husband.
Calls to Santa's Workshop at the North Pole have not been returned.