You can't discount the possibility she thinks you're to blame and she'd rather hole up in the bedroom than spend time with you. There is no chance...zero, zilch, none, of getting your relationship back to working if you lose communication. It takes an open and honest discussion between the both of you. Sometimes that's hard because feelings are hurt, hackles are raised and it ends up in the negative column. If you two can't do it alone, you need to agree to counseling. If that too fails, you at least know you did everything you could possibly do to keep the marriage together.