"Assuming" she is over 18 (over 21) I can't see any problem. I seriously doubt Texas has any "restrictions" on gun ownership, again over 18 etc. Transporting a firearm YOU OWN has not been an issue except in some Eastern States, then usually handguns and semiautos. Texas, please, isn't it illegal to NOT have a gun in your possession????? SELLING a gun interstate is another matter.