Deductions & credits

My daughter is a full time college student under 26, so I have been able to claim her as a dependent.  She files her taxes on her PT jobs and she always checks that someone else is claiming her on their taxes.  Is there a cap on how much she can make as a FT student that is being carried on her parents tax return?  We still provide over half her support, she usually only makes 4-5 thousand a year during the summer, plus PT while she is a FT student in college.