"Well I disagree. You took this job knowing about your commute. You must of known about the lack of time between shifts. You've created this mess, now you have to deal with it. If I was your employer and I found out you were calling in sick because of the commute I would let you go immediately."
Ahhh, just another compassionate member of the nursing community passing judgement. Forget that she's exhausted and could make an error that puts a patient at risk! Just make sure that shift is covered!