People do not get it, they do not get it at all. Including some people that had depression (maybe a mild depression) in the past do not get it. And people ( and I think all of us ) have a hard time embracing processes, reactions, behaviors, belief systems, etc that are different from what they regularly think, do, or expect. It is hard for people to listen, they are prone to give recommendations, uninformed opinions, they even get mad if you do not do what they told you to do. People tend to be bossy or paternalistic particularly towards people with disabilities or mental health issues. They are often judgemental, I am talking here about good people even.
People would not regularly speak about stuff like Quantum Physics if they do not know about it, but would tell the dumbest things to somebody with depression or in a wheelchair. Sometimes even doctors and nurses can be really stupid.
But, anyway, it is so good to have somebody that loves you, although she may not get depression yet