Hello Sandra
Thank you for your nice comment. I think that María Candelaria Ulloa is not the last Ulloa on your tree, since it is confirmed that her parents were Nicolás de Ulloa and María de Muñoz, so they are the last ones :)
Here is María Candelaria´s wedding record in case you don't have it:

En postrer día del mes de octubre de mil setecientos trece años, casé y velé en facie ecclesiae a Pedro de Vargas Castañeda, hijo legítimo de José de Vargas Castaneda y de Francisca de Vela y Rodas, de la feligresía de Teúl, con María de la Candelaria de Ulloa, hija legítima de Nicolás de Ulloa y de María Muñoz, españoles y vecinos de esta feligresía; fueron testigos Salvador López y Antonio de Castro y porque conste lo firmé.
(On the last day of the month of October of seventeen thirteen years, I married and veiled in facie ecclesiae Pedro de Vargas Castañeda, legitimate son of José de Vargas Castaneda and Francisca de Vela y Rodas, of the parish of Teúl, with María de la Candelaria de Ulloa, legitimate daughter of Nicolás de Ulloa and María Muñoz, Spaniards and residents of this parish; Salvador López and Antonio de Castro were witnesses and for the record I signed it)

The link to the record: https://www.familysearch.org/ark:/61903/3:1:939N-BR99-65?i=524&wc=3PS7-…

Who of María Candelaria's children is your ancestor? I have four sons registered. Nicolás Alexandro, Francisco, Joseph Manuel and Buenaventura. My ancestor is Joseph Manuel. His godmother was Melchora Marqués de los Olivos, so I think that there is a probability that his great-grandfather could be Nicolás de Ulloa (Marqués de los Olivos). I hope to find more evidence.
Regards
Jesús Ibarra