Jo Cox was preparing a report on the dangers of nationalist radicals before she was murdered, it has been reported.
The Labour MP for Batley and Spen, who died after being shot and stabbed on Thursday, planned to launch the report on June 29, according to The Times.
She had also recorded a video about preventing Islamophobia, the newspaper said.
The report by Tell Mama, an organisation that monitors Islamophobia, shows an 80% increase in anti-Muslim attacks and warned Yorkshire was a "hotbed of far-right activity".
In the video, Mrs Cox discusses the problem that in her constituency saying "many of our young women don't feel safe when they're out on the street".
Concerns are said to have been so great that the local council asked Tell Mama to create an initiative to help them tackle the issue.
Tell Mama Director Fiyaz Mughal told the paper: "In the last 18 months South Yorkshire is one of the leading areas in the country (for Islamaphobic incidents)."
He added Mrs Cox was passionate about tackling the issue.
"The video shows the person that she was - standing up for what was right and for tough campaigns that may not be that popular, such as tackling Islamophobia."
Mrs Cox was known for her commitment to causes such as the plight of Syrian refugees.
Thomas Mair, 52, will appear at the Old Bailey charged with her murder later.