she used to be at omen islands but ive been gone a while, is she still there?? or do i have to get a hydrus pet a different way? :0

She escaped as part of a plot a while back. Now she randomly shows up on the map from time to time. Keep an eye out for her, and you can still get a Hydrus pet.

Edit: More info and a ping group here: https://subeta.net/forums.php/read/869600/Merana-ping-group-hydrus

ahhhh no wonder i missed it, thank you for the info!