Maisy Hollinshead showed her discovery to her mum, Jenny, who described what she saw as ‘eight lumps with lines running through them and brown heads’.
The Stockport family reportedly felt ‘queasy’ after realising they had already eaten three other packets of the same box of rice.
According to Manchester Evening News, supermarket Morrisons’ head office has launched an investigation into the own-brand boil in the bag rice.
Jenny claims she was ‘angry’ the supermarket, who has since apologised, didn’t immediately apologise after she contacted her local branch and their head office.
The concerned mother spoke of her daughter feeling worried she may find something else in her food.
She told the Mirror: “Maisy has been checking all her food since it happened. She’s only 12 years old and she could have very easily eaten it.
“At first, I got no apology, they just said they’d look into it and that’s what infuriated me.
“They only apologised after I contacted the paper and put something on social media, then they got back to me and apologised.”
At the request of the store, Jenny has sent the packet to the firm’s head office so the find can be fully investigated.
Morrisons have referred the matter to their Food Technical Team to carry out a full investigation.
Executive customer co-ordinator for the CEO and chairman’s office at Morrisons, Lorraine Dickinson, said: “I was sorry to learn of you and your daughter’s findings when opening the rice you purchased from our store.
"Please accept my sincere apologies for this.
“I did refer this matter to our Food Technical Team who have requested, so that a thorough investigation can be completed it would greatly assist if you could return the sample to ourselves for examination.
“Once this information is to hand, please be assured that this matter will receive our prompt attention.”