In a tweet, Horner once referred to Margaret Thatcher as "our 1st Lady of girl power’" following her death.
Geri deleted the Thatcher tweet, posted in 2013, and apologised for causing any offence – but then stood by her original comments.
She later said: "I was so confused and overwhelmed by some of the feedback I received that I took my tweet down and for that I was called spineless.
'Did I even really know enough about Margaret Thatcher?’ she added. "Was I just trying to be relevant? She had obviously upset a lot of people."
Geri went on: "Now I realise that I do admire a woman, whether she is right or wrong, regardless of her opinions. She had the courage to stand by her convictions. Not like me. I look at my behaviour, which exposed how weak I was under fire, not like Margaret Thatcher. Rest in peace."
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