Talk to her- now! Tell you what you told us, that you love her and are shocked to hear her feelings. Ask her to go to counseling with you so she can express whatever it is she needs to express while you listen.
Yeah, I know it sucks. But if you want to save this relationship, you have to work this out and the only way to do it is with professional help.
Broken Leg Brewery
Giving beer a leg to stand on since 2006