<human>: I have never posted here, but I am hoping for a little outside perspective. My sister is 21 years old. 6 weeks ago she moved from Michigan to a new, large, city to live with my mother. She is signed up to start at a well known university and things seemed to be going well. On Friday, she received a brand new MacBook Air for school. She was really happy about that and seemed to be getting along especially well with everyone. On Friday night, at 8pm she went to a local bar where she likes to perform Karaoke. She texted my mom and said that she would stay there late.

The next day (Saturday) she had not come home. Her phone was turned off and her car was still in the parking lot of the bar. At this point, we all were a little concerned- We were thinking that it was police calling time. 

BUT HERE'S THE TWIST -- My mom went into her room and found a lot of cash (over $700). Sister has no job. My mom also found papers with numbers for strip clubs and escort services. So, my mom went to the Karaoke bar Saturday night to try to find my sister. My sister was there! She was wearing the same clothes as Friday. When she saw my mom SHE RAN TO THE LADY'S ROOM! My mom followed her and talked to her through the stall door- basically said that she wanted to know if sister was coming home. Sister didn't say anything. 

So, it's Monday now. Sister is still gone. Phone is still turned off. Is she a missing person? 

Should we do something? If so, then what?

Can you summarize the given text in a few sentences?
<bot>: Sister went to a bar hasn't come home 3 days later. Mom spotted her the next day and Sister ran away. What now?