you have to whore urself out and get i formation from punters and other whores after you get closer to them by being "one of them", then talk to tucker and get himm to send out a team to rescue her but:
*spoiler*
if you find her before fall around the truck stop area and gift her defensive spray you can prevent her from getting kidnapped, (it has consequences if she gets kidnapped iirc), its the first thing i always do get her friendsship high enough and gift her the spray it takes a while to find her tho if you are unlucky atleast