I took First Aid AFTER I got out of nursing school
and had worked medsurg for a year. I went up into the mountains to be a camp nurse for a summer, and needed First Aid skills that were never taught in any hospital clinical training I'd ever had. Specific education for specific areas of work. I'm now in ER, doing trauma- that took more training too.
Did you mean to imply the person couldn't pass her First Aid class and still wanted to be a nurse?
I stopped at an accident scene one time, a person who self identified as a home health nurse wanted me to roll a non breathing trauma victim on his side so he wouldn't vomit. NOT! I asked if he was breathing, she didn't know but "he has a pulse so he's OK", what part of the ABCs did she not get? Nursing school doesn't teach first aid (but the ABCs are pretty mandatory