I am hoping, and at this point still leaning to Saniyya having become emotionally overwhelmed with pressure from her engineering studies and TWO jobs. She may be an over achiever and has high expectations of herself. We don't know if her parents have certain expectations of her too, but that too can add to the pressure.
It worries me that she has not contacted family, but it's possible that she might feel shame of fear of disappointing them, if for example she is reconsidering her future profession. As a sophomore, 2nd year engineering can be the year things get tough compared to the first year introductory courses.
It makes me think of a classmate of my daughter, who was pushed into medicine, which he really didn't want to do....and he fell apart in his second year.
If NF is a special place for Saniyya, maybe she went there to find some comfort or inner guidance, and from there she decided to go east to Westchester, Yonkers or wherever that was also familiar to her...I dunno.
All speculation.
Hoping for the best for this lovely young woman.