If Albertina was born in 1851, then in Italy you will not find her birth certificate, as records in Archives started to be collected around 1860.
You can find her baptisme act, but only if you know in which parish this happened...
Instead, you can find her marriage act, because she surely was more than 9 yrs old when she got married, so this act will be registered in the Archivio di Stato.
Usually marriages took place in the maiden town, so you should look in Parma first.
Try to contact Parma's Stato Civile, and send them an enquiry with your ancestors data.
This will be enough if they got married in Parma, but if Albertina originally came from the towns surrounding Parma, you'll have to ask to the Archivio di Stato of Parma.