It's really really late but... yes. Sorry for necro'ing a thread but this was top of the searches when I came looking after exactly this issue.

When 3/4's of the boss' difficulty is its ability to pivot and hit you when the animation makes it look thoroughly committed, there's something up.

1-2 hits, dodge, rince and repeat, if you are in betty's back care of the revert swing, rest is pretty much tempo as the roll need to be dodged a bit after betty's land on the ground, and laterally.
Snowball throw can be side step if you are mid-long range, or dodged if melee
Opening with 2 x bombs is good too, and you can throw a bomb or use magic after the jump betty's do after rolling attack.