I assumed that firefighters always ask for the name and how someone got into something. If in the reportage (I only had access to the video at sputnik at the time of publication) they said it was a mystery to them I assumed the woman didn't know how she got there or who she was.
Ok, so we basically can't say „that she doesn’t remember how she got there“ since the data at hand doesn't provide that information. Stating it that way is a statement of fact, which isn't true from what we know. What we can say however is that we ASSUME it to be that way. Big difference! If she remembers or not is pretty much one of the most important puzzle pieces in the whole case, so we should be careful how we phrase things.
Notice also that in the video above the rescuer states "from what I heard of, it was a pretty limited discussion back there" (aka: with her), which could mean, among many other possibilities: that she was intoxicated, was traumatized, couldn't speak or had difficulties to speak, speaks another language, might be retarded, has a head injury, is embarrassed about the situation and so on. That doesn't necessarily equate to her "not remembering".