I was on Celexa, the precedent to Lexapro, for many years. I know it's REALLY hard on a person to be in a relationship with a depressed person, but if you stick it out the medication will seriously help. The fact that it's winter isn't helpful either. Just BE there for her, and let her know you are there for her. It's a hard hump to get over, but as long as you're helping her, she'll get there.