So sorry to hear about your cat, Megan. Nice to get the survivor a new playmate. You may have to keep them separated until they get to know each other, sometimes they will fight big time. A door between them, then they can stick a paw out underneath and check each other out.
Do they have a meet and greet room? Here, you can bring your kids and pets to the HS, and introduce them to the prospective new family member in a nice separate room.
She who dies with the most toys, wins.