Family of hit and run victim: it was a 'cowardly act'

Kiesha Thompson, 23, died on Friday in what police believe was a deliberate hit and run. (HANDOUT/QUEENSLAND POLICE)

The family of a young mother allegedly targeted in a fatal attack with a car in Brisbane are struggling to understand the "cowardly act".

Kiesha Thompson, 23, was deliberately struck, police allege, by the four-wheel drive while walking home on a footpath after dropping her daughter at day care south of the city on Friday. 

Ms Thompson died in hospital that night and Queensland Police later charged 24-year-old Larissa Rita Mae-Leigh Sant with murder after she was arrested in Yamanto.

Floral tributes were placed at the site of the attack in Daisy Hill before Ms Thompson's family released a video statement late on Monday.

Kiesha Thompson's family are struggling to deal with the loss of the young mother. (HANDOUT/QUEENSLAND POLICE)

In the footage, released by Queensland Police, Ms Thompson's family fought back tears as they remembered the 23-year-old and vowed to take care of the "light of her life", her baby daughter.

"She was taken from us in a cowardly act," Koby Torto said of his sister Ms Thompson.

Police allege a 4WD vehicle - a silver Toyota Prado - was in the area for an extended period of time before the incident.

On Saturday they seized a damaged silver Toyota Prado at Goodna, west of Brisbane.

Ms Thompson's aunt Amanda Matthias described it as a "horrific and senseless act".

Her sister, Keyara, said the pain of losing her sibling could not be put into words.

"We are struggling with the enormity of her absence in our life," she said.

Mr Torto said the family would now rally around Ms Thompson's young daughter.

"My sister Kiesha had nothing short of a difficult life," he said.

"But in the past couple of years, she worked tirelessly to create the best life, not only for her but her child who was the absolute light of her life.

"We are here to support her (daughter) throughout her whole life."

The family have set up a GoFundMe account "so her daughter can have the best life".

They also requested they be left to "grieve in peace".

Sant was remanded in custody after her matter was mentioned in Ipswich Magistrates Court on Monday.

Police have declined to say if the women knew each other.

Sant will next appear in Beenleigh Magistrates Court on July 31.