To be fair, most bikes are build to withstand way more than what she's doing there. Most bikes' weight limits are anywhere from 220 to 250+ lbs when stationary. Bumps in the road, riding off curbs and things like that increase the load even further, yet failures are rare. I have no idea how heavy she actually is but the highest number I've seen was around 200 lbs so she's still well under the limit. Her problems are underinflated tires (risking a pinch flat and rim damage - the lack of those means she probably had not been riding like that for long) and wrong frame size (she has a 48/19" but IMO should have a 53/21"). Now if that were Tess, then it would probably have to be a custom-made bike designed for such a heavy load. But we all know that Tess wouldn't even go near a bike, let alone actually ride one.