Hi Mervione,
I think lots of people just forget about the feedback part, and are not being rude at all, as it is optional. I know it means a lot to us sellers, but I think they are just happy with their purchase, at least hopefully, and go on with their busy lives-----when I used to receive a purchase, there was often a note asking me to please leave feedback, so that might be something for us to try? But there is no way to make someone do it. It can also be that the buyer is new too, and learning about the whole process. It certainly is up to you if you want to try to email her again.