Sorry I'm late to the party, but I don't think anyone's mentioned these options (mostly plumbed from mythology/folklore): Full frontal nudity. Either from the femme fatale 'set one primal instinct (bloodlust) vs another (sex)' perspective, or from the 'don't fight a crazy person, you never know what they're capable of' angle (substitute other ridiculous act for nudity as necessary). Either angle could pause the mayhem just long enough for getaways or explanations. If she's magical, maybe she can cast some sort of glamour without actually exposing herself. The whole 'setting the mob against each other' thing. Maybe she can use her rudimentary telekinesis to smack one mobsman with another's pitchfork, and before you know it, bam, no more mob. Or maybe she can exploit a specific feature of her surroundings (if caving in a whole roof is stretching her abilities). E.g. if they're in a dungeon under the moat, perhaps she only needs to telekinetically wiggle one little keystone out of place for a torrent to wash away the mob. Obviously she and the prince would need to be safe from the flood, but it shouldn't be too hard to contrive such a set-up. Myriads of possibilities depending on the actual setting you've chosen. Anyway, just some ideas. Maybe one hits upon a solution that matches the tone, style and specific details of your work.
