Wasn’t that also around the time that Dove Cameron was in The Light At The Piazza and was barely performing? If I remember correctly Doves understudy ended up having more performances than Dove herself. There were a lot of people on theatreboard saying how the director was obviously annoyed whenever he had to announce that Dove was still off sick. Maybe the higher ups in Heathers were looking at that situation and trying to stop it happening to their own show. I just had a look at the old Heathers West End website and it shows Olivia as the only understudy for both Veronica and H McNamara. I don’t think I ever realised just how small the cast was for Heathers in London. I guess, with the limited west end run, they never expected their lead to get so ill and therefore never thought it necessary to have backstage swings (there are no swings listed on the cast page of the website). It was really crappy of them to put Carrie in so much danger, they must’ve realised how ill she was. Or maybe, because she never put her foot down, they thought it wasn’t as bad as she continued to perform. Tonsillitis is contagious and she very easily could have taken out the whole cast, it’s incredible they made it to their last scheduled performance!