what rights do i have over my daughter when i gave her grandparents power of attorney
You don't state where you live in Texas.
You definately need to talk to an attorney.
I charge $1 per minute to meet with you and talk.
Email me at fran@familylaw4u.com to discuss.
A power of attorney is worth the paper it's written on. Only a judge can change custody.
I would strongly urge you to talk to an attorney ASAP.