I'm not sure exactly, but there are several Wynonna Earp comics out there. You might want to check with dedicated comic book stores or online databases for a precise count.
Wynonna would be furious. She is very protective of Nicole, and her first reaction would likely be to grab her gun and start looking for clues. She has a no - nonsense attitude when it comes to protecting the people she loves, and Nicole is at the top of that list.
A common theme is sisterhood. Wynonna and Waverly have a deep and complex sisterly bond, and many fanfictions explore this, showing how they support each other through the various challenges in the Wynonna Earp world.
Another theme is the fight between good and evil. Wynonna is constantly battling the revenants, which represent evil, to protect the town and the people she loves. This fight is not always easy, and it shows the struggle to maintain good in a world full of darkness.