Allie's Courtney wants to support her new friend and would have been there! She cheered really loudly for Sabrina and probably got her a nice little stuffed animal or something.
Hilda was obviously there in the front row to support her niece. She was properly scandalized at Sabrina's song, but very supportive. She brought flowers, and a little teddy bear that she dressed to look like Sabrina's character. She also made some sweets for the whole cast and would have sent them backstage. She's also made a cake for Sabrina at home.
Katara has never been to a musical before, and went to support Alexis after she healed her. She enjoyed herself, and when someone mentioned that it's customary to bring flowers, probably would have picked up a little arrangement for her somewhere.