She showed that she does not have the experience to be trusted with the task - she won't even follow the instruction!
Yes, one of mine would not obey safety instructions when out on a bicycle.
So we decided that although they could manage the physical business of riding the bike they weren't capable of doing so safely, even when riding along with us, so the bike got taken away for a couple of years. With "because you refused to obey safety instructions" given as the answer to "why can't I ride my bike" for those couple of years.