Her mother wrapped the gashed head with a towel.
Determined to finish the tournament, Alvarez returned to the fourteenth hole, having started at hole 10, to take her next shot.
"But I was really dizzy, so I just went to the hospital."
In hospital she was kept under observation for a couple of hours, before being given the all-clear to return to her Lower Hutt home.
It meant she was ruled out of the tournament - which she was leading before the stray ball found her.
"I have never had anything extreme happen to me before. This is my first time anything really weird has happened to me.
"I've heard of stories, I've never seen it happen, but I've heard of stories of people getting hit in the head."
Since the accident she has been monitoring her injury, and said so far there haven't been any issues.
She hoped there would be no problems by the time her next tournament came around.
With Alvarez out of the tournament, Manawatu's Emma Clayton and Napier's Kate Chadwick shared the title.