Trying very hard but finding a solution or a way to make it work very difficult
Dating somebody with mental illness can be incredibly taxing and can often lead to the manifestation of signs of mental illness in the person dealing with the spouse. I've seen the effect I've had on my partners in past relationships when I was faring badly and although I was filled with regret for causing them pain I just couldn't avoid it at the time. I clung to those relationships because it provided me with a semblance of sanity amongst the chaos of my life but in the end my mental illness was too detrimental to our relationship to have it work out.
There must be a point in your relationship where you decide if the pain and suffering is worth it if she won't help herself get help. It's a sensitive topic and a difficult decision but unless people are willing to completely commit themselves to treatment then you'll just be a waning source of support for however knows how long. If you love her and are willing to commit to an uncertain future then you should stay but measure the costs of such a relationship to your own mental wellbeing.
When a couple
She obviously loves you, but it can be very difficult to love someone when they are very unsettled and by that when she is crying and has mood swings, and thinking about having children may shock you because how is she going to cope with children when she can't get on with life now.