The family of Colleen Calgaret, the young Indigenous mother in intensive care after being struck by a police vehicle on Saturday, said they were "shocked and distraught" after seeing CCTV footage of the incident.

The family saw the video on Tuesday.

Jasmine Calgaret, Colleen's older sister, said she was still shaken hours after seeing the footage.

Ms Calgaret said the family was relieved they had the opportunity to see the footage and thanked those who had been supportive of the family.

"We have had a lot more communication with the police this morning," she said.

"At this point I can't speak on behalf of an investigation going on… But we will get to the bottom of what has occurred. We will definitely find out everything, all the information on what has occurred… and have accountability."

Ms Calgaret said the family was in shock and doing all it could to be there for Colleen.

"We need to be by our sister's side. She is still in a very critical condition. She had scans this morning but we don't know anything further at this point."

She said that it was not possible to determine the extent of any damage done because her sister was still suffering from swelling as a result of serious head injuries.

Ms Calgaret said that the family had not yet had all of their questions answered. She said it was difficult to comment on the CCTV footage of her sister being hit by a police car.

"I am sorry… It was definitely not easy to see that footage. That is our baby sister.

"We don't want it to occur to anybody else."

Another older sister of Colleen, Mariah Calgaret, urged the public to be respectful and show empathy.

"One thing we are asking from the community at this point is to be respectful when you are having your opinion… just be mindful of ourselves, we have social media, we are reading what you are saying," she said.

"You would not wish this on anybody, you don't understand (it) until you are in that situation. Be thoughtful of the family and the officers involved in the situation."

Mariah Calgaret said the family was trying to get through it.

"We have questions and they are going to be answered. It is not something that is going to be solved overnight, like our sister's condition, we have to accept the long journey and hope it is going to get better.

"What we are hoping for is to have that bubbly, courageous, outspoken personality, that gorgeous and loving month to be there still.

"No matter how long it takes we will be there for her, all of us."

Ms Calgaret said it was the longest Colleen and her baby son had been apart.

"Our mother is passed, and to see my younger sister be this great mother, we are blessed. We just want her to keep being here to be that mother, that sister, that grand-daughter."

She said the family has no ill will towards the officers at this point in time.

"We don't want people putting words into our mouths," she said. "We want the best outcome for all parties."

Ms Calgaret said the family had felt left in the dark and in limbo in the days immediately after the incident.

Jasmine Calgaret thanked everyone who has been supporting the family during the ordeal and urged anyone with information about the incident to come forward.

On Sunday WA Police Minister Paul Papalia, when referring to the incident and another serious car accident in Perth that had resulted in the death of a woman, had said pedestrians are ultimately responsible for their own safety.

On Tuesday Mr Papalia told the National Indigenous Times that the crash involving Colleen Calgaret was "a terrible incident that was distressing for everyone involved".

"My thoughts are with Colleen and her family at this time," he said.

"The incident is being thoroughly investigated by Major Crash specialist officers.

"On Saturday night there were two tragic incidents where pedestrians were hit by vehicles. As Road Safety Minister I urge every road user, whether you're driving, cycling or a pedestrian, to be cautious, particularly at night."