T.M.
Dear J.,
It sounds like something is going on with your daughter-in-law that you don't know about. Something MUST be going on, why else would she act in this strange way? My uncle was married to someone who behaved strangely, for example, she'd hide when we came to visit. It turns out she had some kind of emotional/mental problem. She's still kind of like that and she can be hostile and rude... doesn't make it easier to be around but easier to understand. Hopefully when your son visits you can talk with him and let him know that you just want to maintain a close and loving relationship with him and mean no harm toward his wife and her family.
Like others have done, I also urge you to get counselling because you must feel like you've lost your son, which is kind of a grieving process. You will need some objective help dealing with that.
As for people who respond in a judgmental way, I think you should completely disregard them. I don't know why people use this forum to judge others and be mean instead of just give helpful advice. For what it's worth I don't think you were harping on negatives in your post, I think you were trying to give the full picture of the situation, the wedding, etc.
Good luck with everything!