Meridy Leeper said she first became worried after the seven-year-old suffered an anxiety attack.
But the next day she was horrified after her child’s teacher showed her a disturbing picture her daughter had drawn.
The chilling drawing showed a stick figure with an unhappy face hanging by a noose.
Meridy, from Utah in the US, gave her experiences in a Facebook post which has been shared more than 360,000 times.
She said her daughter was shown how to harm herself and commit suicide after watching a video inspired by the visual novel Doki Doki Literature Club.
“Please, keep your children away from these things”
The three-minute video, featuring cartoons of Japanese schoolgirls, seems childlike and innocent.
But towards the end, Leeper says, the video shows the girls killing themselves in different ways.
“Kids YouTube, Roblox, Fortnite, no matter how much you think you are monitoring your child, notifications to what your child is watching, it doesn’t matter,” she said on Facebook.
“My seven-year-old child was taught how to attempt suicide by Kids YouTube and these games.”
She went on: “She was constantly told to ‘go kill yourself’ by other gamers, by Kids YouTube. Shown how to.”
Meridy said: “I never thought I would find myself helping my seven-year-old child through an anxiety attack. Please, keep your children away from these things.”
The girl — who Meridy doesn’t want to name — is now having counselling to overcome her ordeal.
It comes as fears grow over suicide challenges and other disturbing content online which often targets children such as the Momo Challenge.
Featuring an evil-looking female character with large eyes, Momo sees a shadowy controller instruct children to perform tasks which become more and more sinister.
Children are “threatened” if they don’t complete their “orders”.
Yesterday, British police issued a warning over Momo as the sick suicide game reached the UK.
One victim, 3, was told to hurt herself after playing Momo.
For confidential support call the Samaritans on 116 123 or visit a local branch, see www.samaritans.org for details.