I have not seen the name Maria Gertrudis Texada in any of my research, that I recall.
In addition to Don Manuel Domingo Garcia de Tejada there is also Don Manuel Gregrorio de Tejada who lived in New Orleans during the same time frame. He was the Royal Customs House Accountant. You can find him and his descendants in the Archdiocese of New Orleans Sacramental Records published books at most genenalogical libraries. Are you living in Louisiana? If not, let me know and I will send you the info I have.
Don Manuel Domingo Garcia de Tejada resided in Natchez, MS. If you are interested in his descendants, I will be happy to help.
You can contact me at the following e-mail address:
bcbarrilleaux@cs.comWaiting to hear from you. Bev