Sorry, I didn't read the thread, so some of this may be repeated. Potential pitfalls that I see (whether they apply will depend on circumstances which you haven't given us information about):
[*]What if she drops out of nursing school too? Will nursing school be so different that she'll not want to drop out of that? If she drops out of both, all she'll have is a GED and college debts. In most cases, she'll never make much and the college debts are therefore that much more of a burden.
[*]Say goodbye to most scholarships. Depending on the schools this could be be a massive financial hit.
[*]Transferring from community college to another school usually means a lot of wasted courses. That means more costs and more time to graduate. Of course, this isn't always true - just 90+% of the time it is true.
[*]Think of her life as a whole. She is already going to be working 50 years before retirement. Why oh why would she want to make that long tedious carreer into 51-52 years?
[*]Loss of the intangible benefits that high school has. Socially and financially this is her time to be free. She won't get it back until she is 70. What is more fun, free time at 17 or at 70? Even if her answer is 70, what if she never lives to be 70 to enjoy it?
[*]High school courses are often free. College courses cost money. Why pay for the course in college when you can take it free in high school? Just have her take courses that count for both. Result = same early nursing school graduation with much lower overall costs.