God has given all of us the gift of 'free will', however what may seem 'right' to us is not necessarily 'right' with God, it is not His best for us, no matter what 'our' reasoning is.
The question of this particular thread topic is, should a Pastor's wife be a part of the same Church?
Indeed she should be; there is something tragically wrong if a Pastor's wife is not there to worship with him and support him in the ministry that God has called him to.
A wife is a man's 'Help Meet Suitable'... period. Meaning she is there for and with him as he ministers the Word of God. Men need the support of their wives in the calling that God has for him and in all that they do. And this does not minimize the wife, for if nothing else it makes her all the more vital, all the more honored, loved, cherished, respected and treasured in this man's life.
She is 'there' for him and with him...she is right there holding him up as he follows God's call upon him, something that no other woman can nor should be doing. How could any woman not be there for her husband? How? Especially when God has called them to be 'One', especially 'One' in worship, honoring God who has joined them together... to be forever 'One'.
Unless her husband is in sin...unless he is teaching corruption...heresy and abomination to the Holiness of God...there is no reason for any wife to not worship in the same house of the Lord alongside and with her husband.