The complainant told a Supreme Court jury on Wednesday that Linda Lee Jones and Tiffany Louise Shaw also laughed when Shaw smashed a hole in a car window with her iron bar and tried to hit the child inside.

The woman said Shaw's "pregnant belly" rested on the back of the car while she used her bar to make stabbing motions into the vehicle and committed "the attempted murder".

The trial of Ms Jones, 43, and her daughter Shaw, 21, continued in Launceston on Wednesday.

The complainant gave evidence about the incident on January 19, 2014 about 3.30pm.

"When I felt the impact I knew they were not wood, I knew they were metal," she said of the women's weapons.

The complainant said the women verbally abused her and repeatedly struck her with metal bars, too many times for her to remember.

She said the women also aimed at her head but she deflected those attacks and suffered a badly bruised and battered torso, arms and hands, including broken ribs and organ damage.

"My finger was facing the wrong way and degloved and it was just the bone hanging out," the woman said.

The complainant said she drove to a doctor while soaked in blood and stayed in the Launceston General Hospital for six days.

Defence counsel Mark Doyle cross-examined the woman and accused her of sending many abusive and threatening text messages to Ms Jones in the days before the incident.

Ms Jones and Shaw have pleaded not guilty to having caused grievous bodily harm to the woman and not guilty to having assaulted the child by trying to strike the child with a metal bar.

Ms Jones has pleaded not guilty to having unlawfully injured the car window, while Shaw has pleaded guilty to the same charge.

The trial, before Justice Robert Pearce, continues.