How do I break up with her?

If I word it poorly I'm worried it will make the problems she has been having worse, but I cannot keep it going for too long because it will hurt both of us more if I drag it out. I am not happy about leaving, I have already met her family and father, and I was lucky enough to be welcomed.

It's especially difficult considering the messages I woke up to this morning, and I cannot tell her the real reason for breaking up is that I am no longer interested in her, or those issues she is having will be made much worse.
How do I break up with her?
How do I break up with her?
How do I break up with her?
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