A B&Q branch is investigating allegations that a disabled child suffered a head injury after falling from a shopping cart.
Tiffany Zimbandu's mother says she was shocked after suffering a concussion after an incident at a store in Cheltenham.
The four-year-old, who has Down Syndrome and Vitiligo for skin condition, was brought to the nearest A&E after the fall.
Her mother, 40-year-old Michelle Owino, told Gloucestershire Live that the clerk had "cracked her head" and badly injured her on the back.
The mother and daughter were sent home from the hospital with a handful of prescribed painkillers and a pamphlet for head injuries.
Doctors at Cheltenham Community Hospital told worried mom to keep a close eye on Tiffany for at least 72 hours.
Mr Ovino claims the incident will leave Tiffany so terribly ridden in a wheelchair that she will have to push her around in wheelchair shops, which makes it "very difficult" to shop.
She: "I'm not happy. I'll write a letter because she has Down Syndrome – it's very difficult.
"It could affect her all her life, in the sense of shock. She won't feel safe walking in the cart anymore, so that makes things difficult for me.
"It's absolutely disgusting what happened."
Also suffering from joint hypermobility syndrome – also known as double compound – Tiffany occasionally relies on a wheelchair to get around.
The medical condition affects her balance and often causes her additional pain.
Her mother was at B&Q, in Golden Valley Shopping Center on the outskirts of Chelton, shopping for beads for her laminate floor at the time of the incident.
Mrs. Ovino, a full-time carer for her daughter, nailed her in a stroller seat.
As her back was turned, the plastic seat snapped and sent Tiffany slamming into the trolley's metal bed.
Then the alarmed girl screamed as Mrs. Ovino rushed to help her.
After the incident, her mother told her she was "lucky to be alive".
She said, "She fell back. Her head cracked to the bottom of the cart.
"The back of the wheelchair seat was clinging to her back. The plastic bit she was sitting on in her chute was completely torn from the metal.
"She cracked her head very hard. It was a terrible shock. You don't expect a place to give way to a child. That could kill her."
No staff came to the aid of Ms Ovino and her eldest daughter, 16-year-old Chantel, she said.
B&Q has promised to investigate the cause of the accident.
A company spokesman said: "We can confirm that on August 13, 2019, at our store in Chelton, there was a customer complaint regarding a wheelchair. We are investigating the use of a wheelchair so that we can respond to the complaint."
Ms Owino is in the process of filing a formal complaint with the DIY giant.