From what you've written, there is absolutely no reason why she should have been ve'd, had an ARM and put on the monitor. She was low risk and the midwife should have been able to tell from her behaviour and the pattern of contractions that she was nearing full dilatation. If there was nothing visible by the time your next ve was due then you would examine her again and providing progress had been made and both mum and baby were well then you just carry on and wait! I'm sure she would have delivered by then anyway. Did the midwife examine her too? Sometimes if there is a rim of the cervix left and the waters are still there, midwives will break the waters to speed things up but you're not supposed to. But we know these things happen....

Would be a good one to reflect on. There is absolutely loads of articles on ARMs and why they shouldn't be done on normal, low risk women so you will have plenty to discuss/argue in your essay.