it's not as easy as saying there should be a 'standby'.
a lot of the smaller domestic units all around the world are worked by solo watch controllers - have worked a couple of these myself.
at least it was only a 'hold up' due to a late controller and not a 'closure' (or TIBA) due to NO staff! - as is happening more and more.
she is probably a good controller who had a bad day and is now copping the associated sh1t for a very easy to make lapse. I just hope that we don't end up losing another controller by it getting blown out of all proportion.
good luck to her
ps - ask for a pay rise to get a new alarm clock!