When this happened Mervamon decided for her own reasons to forcibly merge a bird digimon with Ziana, which has made Ziana what she is now. Which is a harpy like digimon. She doesn't know what attacks or so she can do. But she is adapting to this life.
As a note this is the player of Ziana_Rivasier check that character or The_Workbench for preferences.
Do note that she lacks her shapeshifting powers and hasn't got her advanced technology, just any digimon powers and the ability to fly and consume.
Digimon / Harpy form looks like
Drawn by my friend Jcdr