I am seriously trying to understand why should this be asked to a girl while she is visiting her parent's house.

Why does she need to give an explanation/question herself, for why she is going to her maternal house.

She wants to go, so she is going.

This is a very simple answer to all the Sasural wala people. Please stop telling married girls what they should do. Let her decide.

Make her feel she is part of the house. Giving only your responsibilities will feel like a burden to her, at least initially. Give her time to adjust.

Even when you move a small plant from its place it is stressed and takes time to adjust to the environment. Here you are dealing with a human being with emotions.

Sharing a quote my friend Neha once shared with me...

झाडांवरच फुल म्हणजे आईवडिलांच्या सानिध्यात जगणारी मुलगी.
खऱ्या खुऱ्या जीवन रसावर फुलणारी कळी. ती तोडली की संपलं.
सासर फ्लॉवर पॉट सारखं असत. तिथ मुलगी सजवली जाते,
रुजवली जात नाही. - va pu

A beautiful quote by my husband which applies everywhere ...

Jiyo Aur Jeene Do :)