[@Absolis]
Making 3 sonic booms in a row would simply mean her tentacles went over the sound barrier, back under it, over it, under it, and over it again. The only way to create a sonic boom is to break the sound barrier. Moving at 2x the speed of sound does not create 2 sonic booms.

The weapons being used were not bullets. A bolter round is a metal slug approximately the size of a man's fist, filled with a high-powered explosive charge, and tipped with an adamantium tip to rip through heavy armour. It's effectively an armour-piercing missile, except rapid-fire, and coming from a gun. And that is the Space Marines' least impressive weapon.

So while Ika Musume is certainly one of the few people that could fight Apocalypse head-on, I doubt she would have survived long against the sheer firepower of the Space Marines.