From what she has told me, she is in contact with some family but cannot live with them. She did not look comfortable talking about the family part. A lot of homeless people, unfortunately, are mentally ill. And, a lot of homeless people that I have spoken to are very articulate which makes it confusing for someone talking to them to get a "fix" on the person.
On some days, I have noticed her as you described her and on other days she has been deeply suspicious and jumpy.
This sounds horrible, but I wonder if in her own way, Angela is living a life that exactly matches what her emotional and mental status can handle. The ability to get away when she is freaking out inside. I wish that she had physical protection from the elements despite her problems, but as we all know because we live it (unless we were born rich) the acquisition of physical protection and creature comforts come with the ability to maintain some semblance of mental stability.
I am so glad people are interacting with her so that as she lives on the periphery of "society" people are still not completely ignoring that she is human.
I am proud to be part of a community that can see beyond judgement to the understanding that there are people out there who struggle mightily and painfully. And, it makes me happy when I see people post on here that they have reached out to her no matter the reaction they actually receive from her at the time.