Get lin lins help thats how i rescued her
you have to learn the mens schedules from fawn then i went to lin lin paid 300 credits you can also get the mens schedule from lin lin you also get the schedule from sammy this makes you deal with less men while rescuing cassie you can ask lin lin to steal the guards key or to attack them.And if you go to the homeless area you can ask them to help you as protest then you find the hobo that went missing in the gentlemens club from there you can get the homeless into new ark and then u can get adrlenes helps! then u should be able to get cassie out safe and u dont have to leave the city