Ms Brown, from Raphoe, has not given a reason for her decision but said it was a sad decision for her.
“I have been left with no choice. Certain things have happened over that past few days that have really disappointed me.
“These are people that I truly had respect for and I feel there is no way back. “I can’t comment on their decisions other than to do whats right for me, thank you for all your support and I look forward to the future and whatever it may bring,” she said.
Ms Brown has been inundated with messages of support on her Facebook page last night by family and friends.
Ms Brown is well known through Donegal and the north-west as part of the band , The She Amigos and was popular with listeners with her show The Donegal Doll.