how do i avoid her laser attack she keeps killing me with it its doing 66 damage and i only have 101 hit points

For starters, she must have boosted her POW to be able to do that. If you ever see her charge (red circle) instead of attack, take out thehead as fast as possible.

As for the attack, look at her eyes' position, and wait a bit before executing the jumps necessary. (e.g. if one towards Mario is higher and Luigi's is lower, jump with Luigi after about a second.)

I suggest you get a lot of Mushrooms and the Mush Badge AA and attack with Chopper and Cyclone Bros. to kill her quickly.

ok thanks alot i beat her 1 hour ago

how did you even get 101 hp?