Well if she is happy with being in an arranged marriage then I guess is ok, although I cannot see how can someone be happy about marrying someone who they do not love, just to say they are married. Is sad, but hey it happens. The reality is that even thou is perfectly fine in your culture, in our culture that is plain slavery. People should marry each other because they love each other and both pick each other as partners. Neither her mother nor your aunt knows what's best for you two. Only you two know that. However, that is how we see things in our culture, your culture may differ. In the end, there is no right or wrong, there is just, is, a neutral state of being.