I took the Dave Ramsey course, Financial Peace University. This has helped me so much!
I don't know why your cousin wants to do this, but I would be cautious as to how this will affect her credit score. Also, did she compare the interest rates as to what she is paying now and what they will charge her.
With regards to her auto loans, what happens if she wants to sell one or both vehicles?
Back to Financial Peace University, Dave Ramsey really opened my eyes and I'm so glad I took the course. It has helped me to rethink my shopping, my bills, what I need, what I don't need, etc.
In fact I believe all teens should take the course.
Hope this helps.