I can't confirm whether she was a spinster or not, but she would only have been 21 when she married George. On the balance of probabilities, it is less likely that she had already married and been widowed by that age, but not impossible.
Looking for baptisms of Hunts in Andover or Alverstoke does not produce any Ann, Anne, Anna or Hannah

There is a baptism in Portsea for an Ann, daughter of William and Ann Hunt, 15 Dec 1808. Another in 1809, for Ann daughter of Thomas and Ann.
Those are the closest by both date and location.

Nell