Thinking outloud. Back in the 90's I worked for a redistributor of disposable paper and plastics for the hospitality industry. I don't recall grocers being part of our customer base but that doesn't mean some of our distributor customers didn't sell to grocers.
It was a little more costly to imprint a bag the way this one was, with the background print - I forget the exact term for it. There was a lot of competition with this style bag as well, and our midwest market pricing was not as competitive as the east coast market.
We had a sales rep in the western PA market, but unfortunately he died in an automobile accident or I'd track him down.
I remember bagcraft and Duro bag were the MFG's we purchased from, though I can't recall if they mfg both paper and plastic bags.
I think if we can identify which bag mfgs were in the area at the time, perhaps we can find a sales rep who might recognize the bag. Unfortunately the two I knew - one is deceased and the other is retired. ugh!
I'm hoping maybe someone else here at WS has some experience in the industry and might recall someone? I'm going to try digging but it is going to be more like cold calls than warm leads going that angle with the industry due to the time and those people not being around anymore.
Somone suggested the bag was perhaps used over her head to suffocate her. That would have to be a good sized bag wouldn't it? Is there a way to determine the approximate size of the bag?