Hi Happehanna,
Don't worry about feeling unnerved. I don't know about you, but I was a JW for more than 20 years. It takes a long time to rid yourself of guilt feelings and and the lingering grip mind control when you have bought into such things for so long. But you do find yourself eventually.
The last meeting I attended was in 1998, but my now-treasured freedom of thought did not happen overnight. On the contrary, it took several years. But now, in the year 2004, I really do feel as though I have returned to my "factory-preset-default setting"; that is, an easy going, tolerant, life-loving person with an open mind.
One of your other correspondants on this thread suggested alternate means of spirituality, such as tarot cards, runes etc. Each to his/her own of course, but I personally have found these to be of value, and I am still an occasional bible reader, and I even say the odd prayer now and then. I use the quaballa, the I Ching, and I have even practiced simple candle healing spells popular among wiccans. Why, I have even found a pseudo "christian" tarot deck, called "tarot of the gnostic saints."
When I was an "elder" (ha ha!), I would have been appaled at any/all of the above, sumarrily dismissing such shocking outrageous practices as a demonic snare! Thankfully, however, my thinking is no longer conditioned and bound by such idiotic myopia, and I can actually think for myself again!
One reads a lot in JW literature (I use the term "literature" loosely!) about the folly of superstition and how we ought to avoid its snare if we want to please Jehovah. And yet the JW's are among the most overtly superstitious people on the surface of this planet! It is because of this legacy, which you are now slowly recovering from, that you are disturbed by your daughter wearing a cross.
Take a moment to remind yourself that it is only the JW's doctrines that formerly conditioned your thinking, not actual truth. You are now free. My advice to you, is to allow your daughter the same freedom. If she wants to wear a cross, let her.
But most importantly of all, dare to believe that you have the freedom and the capacity to formulate your own values and spiritual practices!
Jonty