Because she just is!.
Whilst her marriage to my father did not work out (whew, now I look back on it!), she strove to make sure we had a good relationship with our father, and we still do - even 26yrs later. She strove to provide what she could for us as a solo mother, forgoing things at time so we would have what we needed.
Her choice in my step-father was perfect, and she has a great man in him - I am lucky enough to have two men I consider "fathers" - one biological, one not.
Whilst she did not quite understand it initially - she accepts and loves both me and my same sex wife - supporting us wholeheartedly, and loving us unconditionally. My wife has been part of the family since the beginning - receiving the look only a mother can give when one is being cheeky - and feels very comfortable with my family - something I thank all of my parents for.
In a recent turn of events, she has both supported me and understood where I was at - not trying to change what I felt, but being there all the same. We are trying to conceive using a Fertility Clinic - my mother is excited about being a Granny, and supportive all the way. Recently, she shared our excitement when we got "two lines" on our at home pregnancy test. She also shared our lows when I miscarried at six weeks - sharing with me the stories of the children conceived between me and my sister - stories I knew and have known all my life, but did not understand in the same way I do know. She understood my tears and hurt, and admitted being unable to change things if only she could.
I appreciate her honesty, integrity and her unconditional love.
Of course, I also love her for her stubbornness, and stroppiness also - I know where I got it from!. After all, this is a the woman who told me when I really didn't want to visit a slightly dodgy friend - "Just tell her your mother is a b***h, and won't let you." to help me save face...and grinned while I actually did say that over the phone!
Love ya mum!