Okay, if she contnues to come over you are really going to build resentment and perhaps "overdo" the breakup. You might try to tell her that you like a few things in the magazines but overall you really don't agree with the dogma. You may trust "God" implicitly but there are too many intermediaries in the org between you and God. This is nothing to do with what a good person she is but you would appreciate that she not return again if she is going to discuss her religion.
You are in a delimma because you are really nice....she is really nice....however, she is not respecting your boundries (not nice) and by doing so is pressuring you (not nice) because JWs are really good at making people feel guilty. If you cannot say this to her. Write a little note, put it in an envelope and give it to her, refuse the mags, tell her to have a nice life and quietly close the door. Then go have a drink.