So she walks to the toilet, presumably using the phone to light her way, and then puts it down outside the cubicle? Why on earth would she do that and not keep it in her hand? BTW, he did`nt go quiet after he reached the bathroom. On his evidence he says he did as he got to the bathroom and then starts screaming again after he has looked into it. So there he is, a few metres from her, screaming, and she says not a word? Total BS.
PS IIRC the light in the toilet was broken. So she uses her phone to get to the bathroom and when she reaches it takes the time to open a window but doesn`t bother to turn on the light? And then goes into the toilet and leaves the phone outside on the floor. Doesn`t sound logical at all.