I really don't know what to advise, but I really feel for you. Maybe other gestures such as hugs or cuddles on the sofa would help woo her. I have heard it said that women need little indications that they are loved very often or they won't believe it even if you have told them a few times and someone who is depressed will need more reassurance that they are beautiful and lovable. Small things such as praising her cooking and offering to help or wash up may also help get the message through.
I'm rambling now. The very best wishes,