You may not feel like there is time to mend things, but you can still say what you feel you need to. I have times with my sisters where we don't talk for a couple of weeks because of a fight or something, but none of us ever feels like we aren't loved or like there is no chance for forgiveness.
Just say what you need to and sit with her for as long as you can. That is what's important. Even if you became different in recent years, there is no love lost. I can tell you still love her, so don't think she doesn't love or appreciate you, hun. I'm sure she does.