Sec. 8. (a) In making a determination of unavailability under this article, the court shall consider relevant factors including the relationship of the defendant to the child, the character and duration of the alleged offense, the age, maturity, and emotional stability of the child, and the time elapsed since the alleged offense, and whether the child is more likely than not to be unavailable to testify because:

(1) of emotional or physical causes, including the confrontation with the defendant; or

(2) the child would suffer undue psychological or physical harm through his involvement at the hearing or proceeding.

(b) A determination of unavailability under this article can be made after an earlier determination of availability. A determination of availability under this article can be made after an earlier determination of unavailability.