My cousin is a proud single parent, but often gets crtiticized by her friends and other parents from more traditional families. I think there's nothing wrong with single parenting... Do you agree?

I agree with you. I was raised by my mom on her own and it does not make her less of a person. I think as long as the parent can teach their child proper values and they are not doing anything wrong in order to leave, then no one should judge her. Aja to your cousin!