Agreed that it's probably not you. Many women have low sex drives when they get older, there are medication that will help if she is willing. She should get a full check up to make sure that all her hormones are within normal limits. Depression is another thing, when my depression was at my worst I had no interest in being touched. Considering this is fairly new in the not at all department, I really think you need to push her to see her Dr and you are doing right, as of now, not pushing her for sex. If she refuses or the testing is normal YOU must decide if you are willing to stay in a sexless relationship. While I know that sex isn't the most important part of a relationship it is still a big part of it for intimacy if for no other reason. ~gentle hugs~