Everyone has mentioned the community property aspect, another one is the Homestead Exemption. Even though the property was purchased in your name, your Homestead tax exemption could be in both your names. It is standard practice for both spouses to sign documents at the sale of property even if the second person is not on the note or the deed. This protects the new owner from a sellers spouse coming back after the sale and saying I did not authorise the sale of our home. I wish you luck and a speedy sale.
but I would like to add that if you do use a Power of Attorney you use one from the title company as they do not recognize others. It is very simple, but do contact them.
Cindy Crawford, "The Matchmaker"
Keller Williams Realty-Lake Travis
1921 Lohman's Crossing #100
Austin, TX 78734
Most likely the closing agent will require your wife to sign an affidavit stating that she is aware of the sale. This is very common.
It's done because Texas (like Florida, and a few other places) is a homestead state. You have said that the property is your home--It's the place where you live. The state assumes that since you're married, it's your wife's home too. By having her acknowledge the sale in writing, the closing agent is assuring that you are not selling your wife's home without her knowledge.
I'm not an attorney, but I really don't believe community property is the issue here, since you owned the house before you were married. Good luck.
Maggie Hawk, REALTOR
Watson Realty Corp.
Check w/your title company for best way to handle this.
All the best
RE/MAX Real Estate Center