The one thing that stands out to me right now in your post is about your girlfriend getting stranded and possibly recieving the wrong attetion because of the clothes she wears.

first of all she is an adult right so there is nothing keeping her stranded at those places. she knows her friend goes off with guys after getting her someplace so if she really minded being left in those places she would not go with that friend or take taxi money or another friend with her so she had a ride home. Your girlfriend is not being taken advantage. It is her choice to go out with this friend and it is her choice to remain in those places after her friend leaves with a guy.

clothing will get her the wrong attention, Weomen wear the clothes that they are the most comfortable in just like men at times like to wear pants that slip down or are so tight there is nothing left for the imagination frontal view or rear view.

obviously she is comfortable in those clothes and yea the attention she gets when wearing those clothes may be her deired outcome But know that if harm rape or other unwanted advances comes her way it is not because she is wearing the "wrong clothes". Too many times survivors of assault are blamed for wearing the "wrong clothes" when they go out and so on. if harm comes to your girlfriend it is because the person doing the harm will be making his / her own choice to have POWER over another human being. Rape and sexual assault is about POWER not sex and clothing.

Talk to your girlfriend and let her know you are worried about her but know that she is an adult and being so makes her own decisions including what she wears and her going out with friends that take off with a guy.