11:35 AM PT -- Bunnie XO just took to Facebook to address the accusations that Kalista's mother made the whole story up saying, "I cut the sale short yesterday after an hour because a lot of the things were coming forward about the mom. Tons of accusations with zero documentation."

She continued, "The proceeds from the shirts that were sold yesterday will be put into a trust fund for her. I'm working out the details w my accountant & lawyer as we speak about that. I also want the record to reflect that her mom has never once asked me for money. She's always maintained that this is about her daughter."

She concluded, "I love all y'all so much for supporting this little girl & showing her that when ppl come together our voices can be heard loud & clear. Excited for y'all to get your shirts & rep them!"

Jelly Roll and Bunnie XO are standing by a Tennessee middle schooler who was allegedly disciplined for drawing the famous couple for a school project by creating a T-shirt with the girl's design.

The Grammy nominee's wife released the new limited-time merch on her Patreon site ... where it appears the $32 tee sold out within the 24-hour sale window. The website asked for purchasers' patience, as they cited high demand for the 2-week delivery timeline.

We're told all proceeds from the shirt are going toward a college fund for the girl, whose name is Kalista.

ICYMI ... Bunnie spoke out earlier this week after she had learned about Kalista's drama at school. She said that she learned Kalista had gotten suspended for drawing Jelly and Bunnie for her school inspiration project -- slamming the school for punishing Kalista for simply respecting their resilience.

Remember, Jelly has become a mental health advocate through his music after overcoming his drug addiction.

While the school has since refuted the fact that Kalista was ever suspended ... the middle schooler's mom, Delisa Patrick, clarified her daughter was sent home from school after handing in her assignment. She also noted this situation occurred last year, even though the story's just taking off now.

As Delisa put it ... Kalista was previously warned to not select the A-list couple for the homework assignment since they were viewed as inappropriate. Delisa shared she stood by her daughter's decision since Jelly has such an inspiring story about turning his life around.

Kalista returned to school the next day, but allegedly had to be picked up again as she was facing bullying over the project.

Delisa applauded Jelly and Bunnie for standing by her daughter ... but asked people following the situation to not harass the school on behalf of Kalista.