I don't want my mom to come to my graduation
Why keep your mom from seeing you graduate?
She has never given me her time when I've needed it.
It is fine to feel conflicted about a neglectful parent, but you shouldn't be petty about this. Try to take the first step and invite them.
She's just a bad person, is all.
Even so, you should still be the bigger person and invite her to your graduation.