It was the phone call every parent dreads.

Susan Johns was woken at 2.29am on a Sunday morning to the news her son had been assaulted during a night out.

"This voice I didn't know said, 'Are you Kyle's mum?', and I said, 'Yes', and he said, 'We've been assaulted - Kyle is laying on the ground in a pool of his own blood."

The injury required Kyle to have staples in his scalp. (Supplied)

Kyle Johns, 19, had been attacked in China Town Mall in Brisbane's Fortitude Valley by a woman who armed herself with her stiletto shoe.

Jazzmin Fry, a 21-year-old woman from Brisbane's southside was a complete stranger to Mr Johns.

"(She) comes to the middle of China Town with her heels in her hand and stabs me in the crown of my head," Mr Johns told 9News.

Mr Johns was rushed to hospital, and his scalp was stapled back together.

Fry pleaded guilty to the assault last week and a magistrate imposed a $250 fine. No conviction was recorded.

9News spoke to Fry outside the Ray White Beenleigh office where she worked, until yesterday when she was fired.

Jazzmin Fry said it was a "drunken act". (9news)

"It was a drunken act. It was my 21st birthday and it's not me. I don't know why I did that and I wasn't in the right mind frame," she said.

Mr Johns and his mum are furious at her punishment.

Kyle Johns said he hasn't been out drinking since the attack. (9news)