Well she's getting a mauling on social media for it, and unwise to underestimate the power of that. It looks frightened, it looks inexperienced, it looks shifty, it looks like she has something to hide ( which obviously she does- she's not going to want to be questioned in a scenario she can't escape from live on TV on some of their dire policies- she just wants a nice safe platform to bang on about claiming our borders back, flag waving, tea drinking, stiff upper lipping and other fun things that seem to warm the cockles of the DM readers hearts). I think it's understandable why she isn't doing it, the only way is down for the person in control at the moment in a live debate, so she's keeping herself as safe as she can. Whatever happens in the election she's in a no lose situation- either she wins convincingly and she can then say she has a mandate from the people to continue to wreak her evil, or she loses to a coalition in which case history does not remember her as the creature that took us kicking and screaming out of Europe. Well played in my opinion.