Fine:
Once R2 has begun, hit her with a multi-damage attack, SuperNova, and
always partner-hit her with Vivian and her hands, only Vivian,, not Mario. Always have Vivian as your partner for what I put in my last post;
Beware of the charge attack, use Vivian's veil to dogde this 12 or 15 damage attack.
Also have that Boo Item to dodge The dead hand parade attack.
Tell me if you need more.