Hi,
I am a nurse / midwife so hopefully I can be of some help to your daughter.
Firstly, You havent stated where in the country you are, I have trained in Scotland but taken up employment in England as the job situation here for nurses and midwives is very poor.
Nursing can be done as a diploma or a degree at university, however the diploma is currently being phased out. There are four branches of nursing, Adult, Child, Mental health and Maternity (Midwife). Depending on which your daughter wishes to study will depend on the entry requirements. The hardest and most competitve to accsess at present is midwifery.
At 13 your daughter should focus on chosing subjects that she could then continue through to A Level or higher if you are in Scotland. However leave her options open enough to change her careers path should she chane her mind by the time it actually comes to chosing her A Levels.
I can tell you what is required academically in Scotland and then you can work out what the going rate is wherever you are in the country.
The minuimum for adult nursing is 5 standard grades ( which is what your daughter would be doing now) at grade 3 or above. and three highers at minimum C level. If you dauhter wishes to opt for midwifery she will require 4 highers at minimum B level.
Essential subjects must include English, Maths and a Science...Biology or Human Biology is desireable. These are the subjects I would definatley follow through to higher or A Level to give your daughter the upper hand when it comes to chosing establishments to study at.
One thing I would strongly advise is to get some work experience in the area she wishes to fucus on. So when she turns 16, get some voluntary or part time work ina nursing home, maternity establishment or any care setting relevant to the line of nursing she wishes to consider. Most places would happily accept an extra pair of hands! (I know I would!)
The minimum entry age for nursing is usually 17 years, due to the emotional impact of the job.
I hope I have been of some help, If I havent answered anything or if you think of anything more...il be happy to help in any way I can. I have two kids aswell, and I value their education more than most things in the world! :)