A Perth mum who only last week revealed her battle with a shock melanoma diagnosis is in hospital tonight - paralysed following a stroke caused by a tumour in her brain.

Liz McLaughlin told The West Australian last week of the stage four melanoma that had left her with tumours in her ovaries, breast and brain and spots on her liver and lungs.

On Friday, she was still well enough to film an interview with 7 News Perth that she hoped would act as a warning to others but by last night she was in hospital unable to talk and paralysed down one side of her body.

Doctors are unsure if they can operate on her brain. Her mother told 7 News Perth that at such a testing time, her family’s desire for others to learn from Ms McLaughlin’s ordeal was stronger than ever.

Liz McLaughlin is now hospitalised because of a stroke.

A month ago, Ms McLaughlin had been a happy new mother, seemingly full of good health and enjoying the special bond of breastfeeding her seven-month-old baby, Ivy.

Even when the 29-year-old complained to her GP of pains in her stomach and breasts she thought it was just part and parcel of motherhood.

But an ultrasound revealed ominous shadows in her abdomen and she was stunned to be told by doctors that she had stage four metastatic melanoma.

Scans showed she had tumours in her ovaries, breasts and brain, and spots on her liver and lungs.

Tragically, it appeared to be the silent legacy from the melanoma she thought she had beaten six years ago when she was 23.

Liz McLaughlin thought she’d beaten melanoma six years ago.

“At the time, someone I didn’t even know stopped me and said they were studying dermatology and they noticed a mole on my back that they thought I should go and get checked,” she told The West Australian last week.

“Because it wasn’t in my line of vision, I’d never noticed it but I got it checked and it was pretty scary because it was a stage three melanoma.

“The doctors removed it and were pretty confident they got it all, and so I just put it down to a bad scare and kept on having regular skin checks-ups.”

For more than five years, Ms McLaughlin seemed in perfect health. She had a trouble-free pregnancy with Ivy, but the abdominal pains started soon after the birth.

She is still in shock from her diagnosis, and believed it showed just how dangerous melanoma could be, even years later.

“Not in a million years did I ever expect it would come back,” she said.

More than ever, Liz McLaughlin’s mother wants her daughters battle to help educate others.

Ms McLaughlin told The West Australian she was determined to use any available treatment, because she says she has too much to live for, including Ivy, partner Tommy Corrigan, and her four step-children aged seven to 14.

“The doctors removed it and were pretty confident they got it all, and so I just put it down to a bad scare and kept on having regular skin checks-ups.”

Last week she had her first round of a promising immunotherapy treatment for advanced melanoma, using a type of treatment that boosts the body’s natural defences to fight the cancer.

She was due to have three more rounds at Fiona Stanley Hospital, using the drugs nivolumab and ipilimumab, provided she can tolerate them without serious side effects.

“I’ve also gone on a health kick and I’m eating really well and looking after myself, and just trying to stay positive,” she said.

“Most people don’t make it to the fourth round because of the side effects but I’m hoping because of my age I can manage it.”

Liz McLaughlin is a stepmother to four and a mother to one.

Mr Corrigan said his partner was a fantastic mother, and Ivy was already saying “mum” without any prompting.

“I’m taking time off work to spend more time at home with Liz and Ivy and one of the hardest parts for me was breaking the news to my other children,” he said.

“But everyone is rallying around us, so we’re hoping for the best.”

A crowdfunding campaign to help with costs has raised more than $12,000. Visit gofundme.com/565r6a-our-lizzee

- with Simon White