They have a website so they can say "We have a website" when they "witness". The "work" is done face to face.
If she's anything like me, Christian life is completely foreign to her mind. Aspects are mimicked as far as I can tell, but that's it. It is strangely different to me. Have you discussed the differences between The Law of Believing and Faith?
I've heard of the party scenario before. They want credit for everything. Birthdays, graduations, weddings, babies. Everything.
There's no middle ground. The Way is very much against marrying those who aren't standing, "outsiders". They will mostly work on her. Certain words her friends say trigger certain thoughts and strange emotions.
The easiest, most comforting thing for her is for you to move her way. ("join" twi). You won't get what you want/need that way. Unlikely.
Her friends will likely remain aggressive. If you walk away, they will keep "working on her" until she's comfortable with twi again. If you push, you will be doing exactly what her friends claim you would do, causing her stress.