Obviously you're not a mitigation specialist lol.
I'm not either, but I've worked with them, and I would say, for starters:
--she's been "abused" her whole life, starting with the wooden spoon and ending with mean old Travis
--she's somewhat deranged mentally and doesn't react normally to things
--she was really really in love with Travis and was under tremendous stress because he didn't love her back
--she doesn't remember killing him, so it would be unfair to punish her for it
--her family would be sad if she were put to death, and just when she and her parents were starting to get along...
--this was her very first crime
--no way will she ever kill anyone again--she's over that now