The woman from nowhere

I'm sick.

Between hospital sessions I was in a cafe and after I'd poured by tea, an elderly woman walked in. Saw the bandage on my arm and asked in a completely confident, outspoken and genuine way what happened to me. I told her that it was a PICC line for a serious illness.

She asked to pray for me. I consented.

She prayed. She left. Didn't buy anything.

As I was driven back to the hospital she was crossing the street and looked at me; I waved.

I went goosebumps.

Is this how angels operate?