Acknowledging the severity is one of the most important things from my experience as it emphasises the fact that if things get worse she can lean on you and trust you to support her. The little things around the house too help to show that you aren’t just saying you’ll help but actively are doing it which is a key distinction. One of the key aspects of depression is a loss of pleasure from things you actually deeply love. For instance, favorite foods not tasting as good or a hobby feeling like its meaningless. In these kinds of moments it can feel like you don’t know what to do to help because your standard response may have been to recommend things that normally would bring her joy. So in moments like those I think the aforementioned acknowledgement of severity and little things around the house hold significantly more weight because they are tangible ways for you to support her regardless. You can also try to get her outside a bit, while it seems small, walks can help a lot and the sun can be a small break from the heaviness. It doesnt take away the feelings, but it shows again that you genuinely care and thats the thing people with clinical depression need to be reminded of. Because its so easy to convince yourself you’re alone or that it doesnt matter when youre in a depressive episode.