there honestly isn't enough information given about this woman :/
but here are some questions that came to my mind.
1.) did they ever try to trace the purchase of the sweater she was wearing? as in where it was sold or where she could have bought it from? I don't know about everyone else but to me, that sweater she was found wearing seems very distinct. I would imagine that someone might have recalled seeing her or recognizing that sweater prior to her body being discovered if they were questioned or presented with it.
2.) I read that she was naked from the waist down when her body was discovered. because of that, there's not a doubt in my mind that she was sexually assaulted. did they test her body for any foreign DNA found in her system? it could help capture the person responsible for her death. also the sweater should be checked for foreign DNA... hopefully that's already been done though.
3.) I read over her dental records, and they seem quite distinct, including the fact that she had 8 teeth with amalgam fillings (correct me if i'm wrong but I believe that's a type of metal material filling. I know that nowadays at least, dentist don't really use that anymore unless I'm wrong, but I believe it might have been more common back then so I would probably guess her age is at the higher end of the estimated age spectrum.
4.) Most importantly, why isn't there a facial reconstruction on what this woman looked like? was her face badly damaged by the cause of her death? where was she shot? how many times was she shot? did she have any other injuries to her body?
5.) also, was there any evidence if she had ever given birth at all? meaning that is it possible that she has a child out there somewhere who doesn't know where their mother is?
these are all important questions that should be considered.