BB15. Kaitlyn was the only female not to make the jury. I can’t be bothered to check the stats on other seasons, this was just one I knew of.
So for each where the modern jury format was implemented the amount of women that reached the jury stage were;
BB4 4/6 made jury (Amanda and Michelle did not)
BB5 5/7 made jury (Lori and Holly did not)
BB6 6/8 made jury (Ashlea and Sarah did not)
BB7 3/6 made jury (Alison, Nakomis and Diane did not)
BB8 5/7 made jury (Carol and Kail did not)
BB9 4/7 made jury (Jen, Amanda and Allison did not)
BB10 5/6 made jury (Angie did not)
BB11 5/6 made jury (Laura did not but whilst Chima was expelled she still made it to the jury stage)
BB12 3/6 made jury (Annie, Monet and Kristen did not)
BB13 6/7 made jury (Cassi did not)
BB14 4/8 made jury (Jodi, Kara, Janelle and JoJo did not
BB15 7/8 made jury (Kaitlyn did not)
BB16 4/8 made jury (Joey, Paola, Brittany and Amber did not)
BB17 7/9 made jury (Da'Vonne and Audrey did not)
BB18 6/8 made jury (Bronte and Tiffany did not.
BB19 4/8 made jury (Megan, Jillian, Dominque and Jessica did not)
BB20 6/8 made jury (Kaitlyn and Rachel did not)
BB21 6/8 made jury (Kemi and Isabella did not)
BB22 4/8 made jury (Keesha, Nicole.A, Janelle and Bayleigh did not)
BB23 7/8 made jury (Whitney did not)
Of the 147 female houseguests who have competed since BB4 101 have made it to jury which is 68.7%. This is actually statistically better than the men's stats where of the 153 only 97 made jury which is 63.4%. So of the 198 jury stage members from BB4-BB23 51% are women. At least half of the women always make it to jury and this is not the case for men. In BB13 only 3 of 7 males made jury. Funnily enough BB All Stars seasons are were the the % of women making jury is low. The lower rates of women making jury also come from seasons dominated by male dense alliances such as Chill Town, The Brigade, The detonators and the Committee. It is also worth noting that in several seasons such BB12 and BB16 where the men alliances dominate, whilst half the women do make jury they are pseudo-pagogned after the jury starts (BB12 Britney was the only one in final 7, BB16 only Victoria made final 5 and in BB22 only Nicole and Christmas made final 5). So whilst women are more likely to make up the jury section of the show, it is the males that make up most of those who make it to the end game.