The certificate was issued to the 'baptizada', that is to Maria Jose Graciosa, on the said date of 29-Feb-1860. There is no event associated with this date, it was a request for a certicate. It is possible that the priest made an error and he meant 1866, not 1860. This makes sense because the church was establishing that the bride and groom were baptised before they married.
They married on 26-Dec-1866. If we assume the priest meant 1866, then this is accord with certificate issued for Antonio Gomes, her spouse, on 20-Nov-1866.
The other possibility, if the date of 29-Feb-1886 is correct, is that there was another event associated with this date that you have not yet discovered. Could it be the baptism of Catarina? Perhaps Catarina was given to the church and her baptism is among the expostos, either in Sao Sebastiao or Sao Pedro, Vila Franca. If Maria was betrothed to another person, this could have triggered the certificate of 1860, as Maria was about 27 years old then.
Some things to think about.
JR