I posted this topc at two in the morning, and when I woke up a few hours later, I had found that many people were willing to share their advice and experiences with me. For that I thank you all.
As for her being 24, this isn't a romantic relationship; she is my cousin. It is an odd situation to be in, I'll say that; but I think with all of the help I have recieved, I can make an educated and wise descision. I'm really beginning to think that the witnesses are detrimental and poisonous people. I simply can't ignore all of these stories of people getting burned by the jw's. I truly feel that this is more or less a once-in-awhile relationship, where I can talk to her emotionally when she needs me to talk to her emotionally. In other words, I kinda feel like a crutch.
I stayed up last night thinking about this, wrestling with this issue in my head. I realized that my mother is the most important, kind, and level-headed person that I know. But I feel that this witness will wind up hurting me anyway. I've seen this person's other relationships with other people, and they always end in shambles. I know that my mom is right...she always has been.
Again, thanks to everyone for everything, it has really helped me. It's good to know that the internet isn't just a bunch of whackos.