I think she lied about her age when getting married (to seem older). She claims to be 19 years old in 1913 (date of the marriage), but seven years later on the 1920 census, she is only showing to have aged four years.
If she didn't lie, she would have only been 16 at the time of her marriage. You can scrutinize the information on the marriage record if you have any of the parents names to compare.