They're in the census 1860, 1870, 1880 then nothing. I couldn't find birth information on Guadalupe nor Rosa. There is a Maria Emelina Beatriz Aguilar born July 12 1871 to Cristobal and Dolores. I found a Beatriz Yorba, niece, lving with a different family. Herdob is given a July 1883(?) the record is not clear. There was also a Beatriz Aguilar who married J Chevalier Preston May 10, 1895.
You probably have already checked with the FHL and checked for baptism, marriage and records for Los Angeles, Plaza Church. (??)
It was interesting to see the census records. In 1860 census, both mother-in-laws are living with/ or next door to Cristobal Aguilar. Catalina B de Yorba is listed and following her is Catalina Nadal. I didn't know there had been Nadals in Los Angeles that early. It's interesting to me because my family is Nadal and mylate uncle, a Nadal, married a Yorba in the late 1930's. We are not related to those Los Angeles Nadals.