Does a girl who frequently has wet dreams need to perform ghusl, given that her wet dreams are not due to intercourse, and she finds a light fluid with no odor, along with her attempt to prevent contractions after waking up?

A woman is not required to perform ghusl (definition) unless she is certain of the emission of semen. The mere sensation of contractions does not necessitate ghusl, unless she is certain of the emission of semen, which obligates it. If she doubts whether the discharge is semen, madhy, or vaginal secretions, she may choose and assign to it the ruling of whatever she wishes.