Should I have dumped her?

You asked her for the stuff you brought her back?? WOW wrong move. First of all that's pretty tacky and soo bitter it's ridiculous. Secondly, she's in college let her enjoy her experience she's only going to be this age once. Your defense is she is "moldable" do you mean impressionable? You make her seem like she can't think for herself. Either way I think you're just angry because apparently you're molding fell apart.