As she is a being tailored to flight, Kaida has hollow bones. 

Kaida cannot use more than one psionic ability at a time.

If her concentration is broken, Kaida loses a connection with her intended target, rendering her psionic attack void.

Her hypnosis is less effective on those whom are strong willed or cannot hear her singing. 

Kaida, although trained to be able to defend herself, is in essence a non-violent being.

If she is able to self-ressurect, destroying the body makes it nearly impossibly to return to life. 

If Kaidas wings are cut off during battle, it weakens her inherent angelic abilities. 

As she is flesh and blood, she can be cut, stabbed, shot or wounded as most others can be.  (excluding drowning)