Interesting thought. I have a feeling that Kara would probably try to avoid the funeral or at least wouldn't volunteer to give a speech. I might be wrong, though. We know that in the end it wasn't Kara's action that stopped her pulling the trigger, so she must have felt at least some guilt of her own when she was giving the speech at Cain's funeral.

Maybe, if she killed the admiral, she would still say the same things about her but would add a few bits about our own choices and responsibilities. I think she would try harder to make Adama and Roslin feel guilty for what they put her through.