My birth daughter who is 19 wants to reverse her adoption or be re-adopted by me. She was adopted when she was 9 years old and is moving to Texas to live with me. What is the process for this.

There isn't one.

She is an adult and can live where she wants.

Why would a 19 year old woman even be talking about adoption? The only valid case I can think of is if she is mentally challenged and, therefore, not a legally recognized adult.

Actually, you CAN adopt an adult in most states.

In Texas:

Texas Family Code
SUBCHAPTER F. ADOPTION OF AN ADULT

§ 162.501. ADOPTION OF ADULT. The court may grant the
petition of an adult residing in this state to adopt another adult
according to this subchapter.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.


§ 162.502. JURISDICTION. The petitioner shall file a
suit to adopt an adult in the district court or a statutory county
court granted jurisdiction in family law cases and proceedings by
Chapter 25, Government Code, in the county of the petitioner's
residence.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.


§ 162.503. REQUIREMENTS OF PETITION. (a) A petition to
adopt an adult shall be entitled "In the Interest of __________, An
Adult."
(b) If the petitioner is married, both spouses must join in
the petition for adoption.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.


§ 162.504. CONSENT. A court may not grant an adoption
unless the adult consents in writing to be adopted by the
petitioner.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.


§ 162.505. ATTENDANCE REQUIRED. The petitioner and the
adult to be adopted must attend the hearing. For good cause shown,
the court may waive this requirement, by written order, if the
petitioner or adult to be adopted is unable to attend.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.


§ 162.506. ADOPTION ORDER. (a) The court shall grant the
adoption if the court finds that the requirements for adoption of an
adult are met.
(b) Notwithstanding that both spouses have joined in a
petition for the adoption of an adult as required by Section
162.503(b), the court may grant the adoption of the adult to both
spouses or, on request of the spouses, to only one spouse.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.
Amended by Acts 2003, 78th Leg., ch. 555, § 1, eff. June 20,
2003.


§ 162.507. EFFECT OF ADOPTION. (a) The adopted adult is
the son or daughter of the adoptive parents for all purposes.
(b) The adopted adult is entitled to inherit from and
through the adopted adult's adoptive parents as though the adopted
adult were the biological child of the adoptive parents.
(c) The adopted adult may not inherit from or through the
adult's biological parent. A biological parent may not inherit from
or through an adopted adult.

Added by Acts 1995, 74th Leg., ch. 20, § 1, eff. April 20, 1995.
Amended by Acts 2005, 79th Leg., ch. 169, § 1, eff. Sept. 1,
2005.

"Why would a 19 year old woman even be talking about adoption? The only valid case I can think of is if she is mentally challenged and, therefore, not a legally recognized adult."

There are quite a few adoptee's who wish to have the relationships with thier families legally recognised by the courts. They wish to have thier origional BC's "restored" which is possible if they are re-adopted back into thier first families. Re-adoption is also a way to restore an adult child's right to inheritence and other legal "benefits" (ie. being able to visit in hospital, make medical decisions exc.) that are afforded to family members....which were stripped from the adoptee when tpr happened(making parent/child "legal strangers"). There is also the sentimental value. Not all adopted children have wonderful lives with happy families....for some adoptees being re-adopted into thier family can be the first step to healing childhood wounds.