When looking across the periodic table from left to right, which of these groups are the first to contain nonmetals? group 2
group 7
group 14
group 18

Yes she is correct. the answer is completely correct

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.