It doesn't sound like the other's went into the room that morning and it sounds like Taz was just there to hang out with her husband and he asked her to stay there in case ANS needed anything, so in her mind ANS was asleep and she just let her sleep... it was her friend Brigett who realized something wasn't right and looked more carefully at ANS and rang the alarm (as evidenced by what she told Rita).
Why don't they talk about Brigette? In their accounts? If she is so key, what's wrong with mentioning this in their interviews? Also, why Brigette, and not Taz, noticing something was wrong? Are we sure Mo never entered her room that morning? We know Howard had been in her room before he magically had to leave.
Then Taz tells Mo she's fine or she's asleep, whatever, only to ring him back almost immediately in a panic because something is wrong with Anna. You say Brigette noticed something. Well, I ask why her and not anyone else? Then, I ask, if she's so key as to be the only one noticing anything, why don't they mention her in their interviews?