THE two women who threw bleach at a mother and her four-year-old daughter while they were driving past have been jailed for a minimum of six months this afternoon.

Sarah Louise Roan, 21, and Lauren Jackson, 22, were told their behaviour while driving through Kellyville Ridge was "extremely reckless", before being ordered to the cells in handcuffs.

An application for bail pending an appeal is expected to be made this afternoon.

Documents tendered to Parramatta Local Court revealed Roan threw a pair of socks out of her car window at an oncoming vehicle because they were "smelly".

Jackson then wound down her window and yelled out "skanks" to two eight-year-old girls walking past.

A full can of V energy drink was also thrown out the window at another passer-by a short time later.

The court heard Jackson then threw a bottle of Harpic White and Shine bleach and gel at a mother who was walking home with her four-year-old daughter and six-month old baby in a pram.

media_camera Lauren Jackson (in blue top) and Sarah Roan (in black top), leaving court on a previous appearance, caused a four year old to drop to the floor clutching her face and eyes, screaming 'It's stinging'.

The bleach splashed on to the four-year-old girl's clothes, face and eyes, causing her immediate distress and trauma, the court heard.

In the police facts, the liquid caused the young girl, who cannot be named for legal reasons, to "cry hysterically and drop to the ground screaming 'It's stinging, it's stinging'."

Jackson's lawyer told the court her client told police during her interview that she didn't intend to hit the mother and her child as they drove past them on May 8.

"I just threw my socks out of the window because they were smelly and then we kept throwing more things out," she told police during her interview.

"I don't know why we kept throwing things out ... it was dumb. We kept finding rubbish and I could smell something bad.

"We didn't see them standing there, I thought it just hit the road and I just kept driving. If I knew it hit her I would have stopped and apologised."

Roan, who has a Certificate III in childcare, had bought the bleach to give to her mother-in-law for Mother's Day, the court heard.

Her lawyer said she has admitted she was acting "stupidly".

"She was not intoxicated nor on drugs, just being stupid. There was no reason for it. She knew she was being an idiot," he said.

Magistrate Joan Baptie said the description of the distress and trauma was significant to the "vulnerable and innocent" young girl.

"The level of recklessness was extremely high," she said.

"This court of the view full-time custody is the only appropriate penalty."

Prior to the alleged attacks, Jackson, a mother of two small children, was also found guilty of stealing two boxes of nappies worth $64 from a BI-LO supermarket at Castle Hill.

Roan stole four tops worth $50 from K-Mart in the same suburb.

The young girl's parents were both in court today. Jackson was supported by her boyfriend and Roan was with her father.

The mother of the injured girl was able to act quickly and run inside the local childcare centre to wash her daughter's eyes out before paramedics arrived.

The four-year-old did not sustain any long-term injuries as a result.