Female plants do produce pollen... And as long as she has no hermi genes in her you will get all female pollen from her...You have to force her to do this of course. It takes what I like to call (end of the world juice). Basically you spray some stuff on her 2 weeks before and 2 weeks after she goes into flowering and it makes her think it's the end of the world. LOL
I know your laughing... It's true though.. Your favorite plants have a gene in them and when they think it's the end of the world or going into the ice-age as an example. They go into self reproduction mode.. They basically make sure they live forever even if there is no Male or Female close by...Females produce male pollen sacks with (female pollen) and males produce female flowers and also produce both female and male pollen just like it normally would.... Both plants self pollinate and wait for the ice to melt.

This method is call selfing in the breading world

I've have read of three things you can spray on the girls to make this work.
Two of them are chemicals you have to buy and the third one you make from home.