Many of the fatalities involving cyclists happen in collisions with a heavy goods vehicle (HGV). This year, seven of the eight people killed by lorries in London have been women.
Considering that women make only 28% of the UK's cycling journeys, this seems extremely high.
Given the very small number of people who have been killed by trucks in London, period, sampling error is as reasonable an explanation for the high proportion of women killed by trucks as any other.