I don’t think there is anything selfish at all about wanting to enjoy your life, I also think you’ve given enough but it is good to hear you say it !
I think we would all wish to see our loved ones recover but there comes a time where a line has to be drawn unless we want to go down as well.
The balls in her court where that is concerned, just as your happiness is in yours.

I’m sure your daughter will appreciate having at least one happy and stable parent in her life who in turn can support her with her future relaitionship with her mother, your learning will be a very key factor in your daughters future happiness

You’ve done really well, keep your chin up

Take care