The problem is if you just ignore the situation there could always be a nagging sense she will land on you doorstep unannounced, and this will be even more embarrassing. I had a quite similar situation and a few months ago came clean by email and the sense of relief when I got the answer was incredible. Went something like this:
Me: (name) its been nice (lie but no feelings hurt) you coming to visit every Thursday but you have probably guessed by the emails and phone calls not answered , and the fact I've not been home the last three weeks, that I want to end our friendship. I don't want to go into the whys and wherefores, just ask nicely that you don't contact me again but at the same time wish you well. Please don't call email or text as I will not reply.
Her: by email. Well I'm sorry you feel that way I've gone out of my to come visit you to keep you company. If that's the way you feel then goodbye! ( then a bit more passive aggressive tripe)
The relief! I was ready to hide the next thursday her 'visiting' day but no, not a peep and nothing since.