Part of what you want to look into is whether or not she will be able to get enough credits through this to finish college when she should be finishing high school or not. If not, where would she finish off her college course work? Often times, depending on where you do your dual enrollment courses and where you finish off your degree, not all of your credits transfer.
It also depends on what she would major in and all of that sort of stuff too.
So, just be aware that it may not end up with all of her credits transferring if she needs/wants them to.