I hope he doesn't ask to search the vehicle, unless she has the gun in a case or Tx allows console carry.. At least in Fla thats the law for vehicle carry, and Fla and Tx are very similar in scope of gun laws..
Gun must not be easily accessable by vehicle accupants, such as in a case.
11. It is lawful to possess a concealed firearm for self defense or other lawful purposes within the interior of a private conveyance, without a license, if the firearm is securely encased or is otherwise not readily accessible for immediate use. Nothing herein contained prohibits the carrying of a firearm other than a handgun anywhere in a private conveyance when such firearm is being carried for a lawful use. The exemption shall not authorize the carrying of a firearm concealed on the person.
Securely encased is defined as encased in a glove compartment, whether or not locked; in a snapped holster; in a gun case, whether or not locked; in a zippered gun case; or in a closed box or container which requires a lid or cover to be opened for access. Readily accessible for immediate use means that a firearm or other weapon is carried on the person or within such close proximity and in such a manner that it can be retrieved and used as easily and quickly as if carried on the person.