No, I have no idea how someone with Heidi's (comparatively) low damage is supposed to beat 75 health-doublings. If we're lucky, it uses CMGQ multiplier rules to go linearly (550-1100-2200-3300) instead of multiplicatively (550-1100-2200-4400-...-2e25). That's still having to kill her 75 times, so it's strong enough to fit. On the other hand, it isn't nearly as terrifying, so I doubt we'll be that lucky.
If we're really lucky, it counts as a save from death and is trumped by Sudden Death. If not, we probably will have to find some way to beat her besides raw damage.