She claimed he pulled the towel down, partially exposing his penis and said, "are you looking for this?"
"I saw the top half of his penis, apologies, and I therefore shielded my view and left the change room," she told the court.
Russell said afterwards she fled into the stands, "very upset."
"I was crying uncontrollably, I was crying like a child," she said.
"I was upset because of what Chris had done because we had known each other for 10 years and jokes of that nature meant nothing to him but upset me greatly."
Gayle gave evidence denying the allegations and said he was never in the change room wearing a towel.
His teammate, Dwayne Smith who was also in the change room at the time of the alleged incident, also denied Gayle exposed himself to Russell.