tahsinmim, converting to islam or to any other religion doesn’t change your mentality overnight.
If in her family the decisions were always made based on her parents' mutual agreements since she was a child, it will be very difficult for her to be thrown out of discussions and to accept any decision made by her husband without listening to her opinion, or fully ignoring this opinion. She will feel humiliated. This is the way the mentality works.
And This is just a sample. There are hundreds of other differences which she will be going through on the daily basis. Trust me I know what I am talking about.