The Caboolture woman has not accessed her bank accounts, used her phone or wished any of her three children a happy birthday since then.

She vanished  – and her family just wants to know what happened to her.

For Sandrine’s sister Christine Day it has been two long years of waiting, wishing and hoping with not a single clue as to her fate.

“I honestly don’t know, as far as I know, she’s dead, there is no way she would not contact us,” Ms Day said.

“She did have a few issues before she went missing, she was saying she was afraid before she went missing and we sometimes get reports of people saying, ‘I just saw her’ but so far there has been nothing concrete.”

Sandrine had broken up with her partner the month before she disappeared and was staying with friends and family.

She had just secured a new place to live when she vanished.

Ms Day said after two years the police investigation had gone cold.

A coroner will now rule on Sandrine’s fate.

Ms Day said her fears for her sister were heightened when the body of Tia Landers, also a Caboolture woman, was found dumped near the Glass House Mountains last week.

A man and woman have been charged with her murder.

“My sister’s case is being classed as a walk off or suicide but for Tia’s body to be found where my sister went missing, it has raised a lot of alarm bells for me,” she said.

Ms Day said that as a concerned sister she was frustrated the police investigation yielded no clues.

“Because it’s been two years they say, ‘we have investigated and done everything now we’re leaving it to the coroner’.

“They have told us she’s a runaway or a suicide, hopefully she’ll just show up one day but after two years, it’s one of those things.

“We don’t want to give up, we need to know the answers. My main objective is not to stop until I do have answers and I don’t care whose toes I step on.”

Ms Day reiterated comments she made to Fairfax Media in the months after Sandrine’s disappearance, that gaining media coverage in her effort to find her sister had proven incredibly difficult.

She said she had been in contact with Ms Landers’ family in the wake of her disappearance and then the discovery of her badly beaten body.

“At least they know what’s happened and where she is and they can lay her to rest, no matter how much it’s hurting them,” she said.

“In my situation I find it hard when we do contact Sunrise and Today and ask to put a story up for us and that story doesn’t get used.

“Then they’ll put a story up about a lost teddy bear and I think, ‘you have got to be kidding me’.

“To a person with a missing family member trying to get attention it’s a slap in the face.

“Please explain why she’s not newsworthy.”

To mark the anniversary on Saturday Queensland Cars Club organised a car rally to one of Sandrine’s favourite camping spots.

In the meantime for Ms Day and Sandrine’s three teenage children the wait continues.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or crimestoppers.com.au.