I just don't know what to do

Bianca • Typical.
This isn't normally something I'd post on her but it's been stuck in my mind a lot now. So my cousin ran away a couple days ago but it feels like years. Her parents are worried for her and so is the rest of the family. She's been planning this for quite some time now and she's been raising some funds so she was ready for this. She's 24 but she's mentally... she's not all there so to speak. She left her papers behind her medication and we found out she's somewhere in San Antonio now but I don't know how to track her. I try speaking to her but she blocks me and it's hurts not to know where she is or if she's okay. I don't know what to do I feel like giving up but my  family is counting on me to figure something out as the detectives said we'd have to track her on our account as they can't because she's over 21.