Man just named a huge ass bird 'tweety'
Yes but a lot of east asian rpg/western-centric fantasy type works have wyverns as a type of dragon. Like how kobolds are german fairies that help with household chores but kobolds in asian fantasies tend to be doglike monsters. So since this lore is dependent on that east asian rpg/western-centric fantasy narrative, I would say it's safe to say that she was correct in calling it a wyvern (for this world's lore). But in the end, that all depends on what this world's lore is.
Looks like she didn't prepare that far (=・ω・=)