WH, Grandma is a name for a SW that a friend of mine and I came up with because she has grayish white hair, which makes her look like a really old woman when she walks. The others on the site here recognize the name because I've associated it with her on here in previous posts I've made. The girls on the street used to call her 'Ponytail' because she always used to wear her hair in a ponytail. She looks like an older version of Meryl Streep a little bit, has a distinctive walk, and of course has the grayish white hair in the ponytail. She used to always be seen walking around Woodlawn and I've never seen her as far down as the adult book stores or the Motel 8 on the opposite side, she's usually in the main Woodlawn area around the school and motels but occasionally down around the fire station area. She has a reputation of ripping people off, and also prefers 'not' using protection. I haven't seen her now in probably about a year or more. A funny side note to this is when we used to give the SW nicknames when we'd see them as we rode around, there was also one that used to be around a long time ago that we called Mrs Hathaway, named this because she looked exactly like Mrs Hathaway from the Beverly Hillbillies.
All the information I have on Melissa besides seeing her as I pass by are from what you and others have posted on here. I haven't picked her up myself as of yet, but as I'm a fan of something she's willing to do that alot of girls won't I may have to partake sometime soon. Most times SW's stories they tell you are often better sounding than they actually are, and even though she may actually be 'staying' at the apartments you speak of, chances are it isn't really 'her' place, but somewhere some date put her into or a place she shares with a boyfriend or something. She does seem more stable than most SW just from seeing what she looks like and how she carries herself, though.