-pick the laser or the pulse shot and take some distance from her, dont stop shooting and destroy every creature that she launches. the laser pierces everything and will hit her quickly, destroying the enemies, while the pulse have wider range and it's easies to hit her.
-the best place to defeat her is in the air, if you're in the air dont stop tapping the jump button, the jetpack's fire destroy the enemies and will protect you from being hit from under.
-she will aways summons a 10t thing when you're above and under her. just dodge.
-make sure of getting 10.000 points before the time ends (you'll get a life for every 5000 points). after that you cannot make more points.
-she's tough. but isnt too hard. fuck her furiously after that