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Do check with her on whether or not she kept reading after a low battery warning, and if so, avoid doing so at all costs. From what I understand, pretty much all flavors of lithium <whatever> batteries, as they discharge, reach a point where the voltage starts to drop, and when it does, the battery will overheat to the point of being a fire or explosion hazard. Because of this, they all have a safety circuit built in that will shut the battery off if the voltage drops below a certain point. Over-discharging a lithium battery a single time can trip this "circuit breaker." Sometimes, they can be reset, but usually not by the average person.
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