In a post to the Facebook page, Ms Ballantyne said she had cancelled her Reform membership after being suspended and being accused of bringing the party into disrepute.
The former MSP told members: “I no longer recognise the party I helped start in Scotland.”
She said she had not posted on the group or “exercised any admin rights” in months.
In an attached resignation letter to Reform’s leadership, she called suggestions she had brought the party into disrepute “laughable and insulting”.
Ms Ballantyne claimed she quit to avoid a “kangaroo court procedure”.
The ex-MSP accused the party of using the newspaper story “as an excuse to get rid of me and then blacken my name should I ever comment on Reform”.
A Reform UK Scotland spokesman said: “As standard practice, we suspend and investigate any members that make or facilitate racist or antisemitic comments.
“Reform UK upholds the highest standards for our members, candidates and elected officials.”
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