Her eat anything ability is used for chewing, swallowing, and digesting things she puts in her mouth.

Her ability to create jiangshi is used for creating jiangshi, temporarily if the subject is living, permanently if the subject is killed by Yoshika.

Those are Yoshika's canon abilities, so I included them. I admit I'm unsure of what's so concerning about what amounts to an undead, amnesiac Matter Eater Lad.