You have to keep talking about it. Keep the communication lines open. You may have hit a nerve in the argument or the whole discussion probably made her feel rejected so she wants to reject you back.
My husband and I had a very honest argument and agreed that we didn't love each other anymore but if we ever got divorced, we would live in a duplex and still be friends. The conversation made me feel a little rejected since I felt up to that point, the only thing I've ever really relied on was his love for me and here he was telling me he didn't anymore. I wasn't really justified in feeling rejected since I told him I felt the same way. We just kept talking about it until I felt better (took a day or two) and the we had make up sex (which was really passionate).
Just hang in there, I feel your arguments are normal. I look at those types of arguments or discussions as a growing pains in marriage.
I would check with her to see if you hurt her feelings somehow. She may feel like she has no right to have her feelings hurt since, after all you guys were just being honest, so she can't really say, "hey you hurt my feelings" so she's trying to get over it and yet the feelings are still hurt and you want to cuddle but her heart's just not into it, etc, etc, etc....
Ya know, I could still be way off too....
