She sounds desperate to be friends, but only on her terms!
Be not in when she calls round, or say you are just off out, sorry, and go out, anywhere. If she calls later, you have a migraine and are laying down in a dark room. You have an appointment sorry. Etc, etc. She will hopefully get the message.
In order to keep it sort of friendly, if after a few days of her keeping away, and then she calls round again, don't let her in but suggest having a coffee somewhere maybe later on the week.
That way you can leave when you want, and you are in control.
One more racist type of comment though, say I don't have to listen to this, goodbye. Just go and never answer the door to her again. She will know why, unless she's super thick skinned.