In her announcement Thursday, she said her priority is family - and the recent birth of her son changed her personal priorities, particularly with respect to the terse political climate.
"There has been a lot that's been written about my relationship with the prime minister (Johnson) and I went out to Downing Street to meet him last week in a private meeting".
Mr Johnson said on Wednesday that he wanted to prorogue Parliament in order to bring the current record-breaking session to a close in order to bring forward his Government's new legislative agenda.
That policy will not change with her successor - this is, after all, the Scottish Conservative and Unionist Party, to give it its full title.
Davidson's straight-talking manner and ribald sense of humour made her a favourite of moderate Conservatives but also popular far beyond the core Conservative electorate.
In the letter she posted on Twitter, Davidson said she intends to pursue her role as the member of the Scottish Parliament for Edinburgh Central until 2021.
"The threat of spending hundreds of hours away from my home and family now fills me with dread", said Davidson. That is no way to lead.
And she added: "I fear that having tried to be a good leader over the years, I have proved a poor daughter, sister, partner and friend".
The voice of protestors there, who are among thousands demonstrating in the wake of a decision by the British Prime Minister to suspend Parliament for a month. I've had long conversations with him on this point.
She said she would judge Boris Johnson on his time in office as Prime Minister, but admitted the two had clashed on issues such as Brexit.
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Florida State was set to make the three-hour bus ride from Tallahassee to Jacksonville on Friday. The threat of Hurricane Dorian along the entire east coast of Florida necessitated the change.
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'All of this has been made more hard with the current political climate, where she's found herself at increasing odds with the new leadership in London. Her spokesman later revealed she had been considering quitting for a year and had informed close aides she wanted to go in the hours after the European Union elections in May.
She was seen as an embodiment of David Cameron's flawed modernisation efforts.
The total was enough to keep former Prime Minister Theresa May in power, amid a disastrous showing elsewhere in the United Kingdom.
And she appealed to MPs to back a deal if Mr Johnson did secure one.
"She has dedicated so much time and energy to the role and has been instrumental in the revival of our electoral fortunes in Scotland", he said.
Scottish Labour leader Richard Leonard said the loss of Davidson would be a "real blow to her party".
"Unusually in political careers, Ruth is standing down as one of the most popular politicians in the country".
The Scottish Tory leader Ruth Davidson has resigned after eight years at the helm over Brexit and because she has a new family.
Scotland's first minister and SNP leader Nicola Sturgeon tweeted: 'I wish Ruth well for the future.
More than three years since the Brexit referendum, the United Kingdom is heading towards its gravest constitutional crisis in decades and a showdown with the European Union over Brexit due in just 63 days time.