Supposedly laid down by Merlin weren't they? Technicality, fire started with magic burns without magical interference, so perhaps she didn't consider collateral from an ongoing fire part of the 1st law? Like drowning someone by immobilizing them for instance? 'I put you in a burning building, but I didn't kill you!'

But hasn't it been stated that if someone uses a blast of wind or force to knock someone back, and they fall off a roof, it's still a violation of the 1st Law?