After being dismissed by doctors, Kate sent one final heartbreaking text.

When Kate Sylvia messaged her mother from the bathroom floor, she thought she was suffering a migraine. 

"Sorry, migraine pain, agony; dying on the bathroom floor," she messaged her mum, Kathryn, on December 1, 2021. 

The next morning, the 32-year-old was still in excruciating pain, and vomiting profusely. 

Concerned, Kathryn called triple-0. She told the dispatcher that Kate couldn't keep anything down, and had been experiencing extreme headaches for more than 12 hours. 

Watch: Dr Golly- Parenting changes the brain. Article continues after the video.

"She's vomiting and it's a huge stabbing pain and she's had a headache since yesterday," Kathryn told SA Ambulance. 

"This has just escalated and I've just called her but she's quite... she can't talk properly," she said.

She was taken to what's known as a 'hospital avoidance centre', a space that provides rapid assessment and acute care for those who "are on trajectory to present to a hospital emergency department, but do not require 'emergency level' care", according to SA Health. 

She was given fluids, anti-nausea medication and aspirin, by doctors at the centre, who agreed with Kate's self-diagnosis, and discharged her with a migraine. 

Kathryn told a doctor her daughter didn't usually get migraines, and asked him why she still sounded groggy and slurry.

"You just need to take her home, put her in a dark room, let her sleep it off," the doctor told her, after explaining she was probably still experiencing the "lasting effects" of the medication.

A stroke was unlikely, he said, for someone Kate's age.

Over the next two days, Kate's condition deteriorated, and by December 3, she was struggling to see or walk without help. 

Kathryn then took her daughter to the Queen Elizabeth Hospital, where Kate was eventually given a bed in the emergency department, after waiting for hours.  

When a scan showed Kate had a right temporal haematoma, nurses arranged for her to be transferred to the Royal Adelaide hospital, but she was forced to wait five more hours before an ambulance turned up. 

When Kate arrived at the RAH, a doctor told Kathryn that her condition could have been caused by contraceptive pills. A social worker raised the alarm, telling Kathryn: "This is wrong. Everything that's happened here is wrong".

He even told her to "get a lawyer".

Kate died three days later. A post-mortem found that she died of brain bleeds and blood clots.

Since her passing, a coronial inquest was launched, revealing that Kate suffered a stroke –misdiagnosed as a migraine – that ultimately led to her death. 

"(She) never should have died," Kathryn said outside the court. "(I was) continually trying to convince people that Kate wasn't well, she wasn't herself.

"She was quite seriously unwell."

Kathryn said she felt like the "system failed her multiple times" and that if it hadn't "she would still be with us today."

Life without Kate had only become more difficult as time went on, her mother said. 

"(It's a) very different life now," she said.

This is just the start of the coronial inquest, which is continuing.

Lawyer Nick Xenophon, who is representing the Sylvia family said that it is an experience no family should go through, and that it's hoped the inquest will prevent situations like this from happening again.

"We are very grateful that there's a coronial inquest because this family deserves answers, every South Australian deserves answers as to why this happened," he said.

"I think it's important that we get these answers so that this doesn't happen again to anyone else."

Feature image: ABC News.