I had never heard of those shoes (I was only three when she was murdered) so I googled them. Here's a picture I found on google. Do these look the same as you remember?
ETA: They were apparently popular in the 80's. Were people still wearing them in the early 90's too? Judging from her jewelry, she didn't seem poor. The website the picture is from says they sold for about $0.99. (Please, if anyone knows, correct me if I'm wrong about any of this - I couldn't find much info on the shoes). Why was she wearing nice chains, but really cheap shoes? The dress doesn't look 'cheap' either. About the ring, it's hard to say without seeing it in person. I don't know if anyone sold upscale ones, but I do remember as a kid trying to win them in those quarter machines.