How difficult for you to see your friend's leaving with others. You will surely miss her. How about making a small journal with the wonderful times you had with her and what you learned from her.
Craig's List had a virtual estate sale a few months ago. There was a treadle machine that was very nice and within my budget. When we got to the house we were the only ones there and had an opportunity to talk with the family. The machine was owned by a great grandmother and she and a great aunt sewed all of the family garments on this machine. Their names were Casey and Kathryn so I told them we would name the machine KC. While there the sellers 10 year old daughter came in and they shared how she was learning to sew from her own aunt and now how she also owned her own sewing machine. She told me she sews pj's for herself and her stuffed animals. Then we talked about quilting and how one could really express themselves through their quilting. Next we bought a set of bookshelves from another of the relatives and they were delighted when I said they would be perfect for my stash as they had glass doors and would protect the fabric from dust. After that they showed me a cute table that they thought would be good for a cutting table. They were so pleased to know that the treadle would be used to sew not just for decoration and that all the pieces coming to our home would be loved and that those who had owned them first would be remembered. That was a day that will be treasured for ever.
How sad that you were not able to have such a wonderful day to remember your friend. You did have something much better in knowing her and having been gifted with priceless time spent together. The woman selling her things is just a rude and unfeeling person, she does not represent your friend. Your friend's belongings did, I am sure, bring much joy to those who took them home as the things I brought home did. They will be lovingly used and lovingly cared for as long as they are mine and I will always remember who they came from.