"La torta della donna è dolce."
"Della" means "of" in this context. "The cake of the woman/the woman's cake". It marks possession. It is also used as an article for things in plural, which aren't counted. Maybe it's easier to grasp if you translate that to "a couple of"/"a bit of" etc. instead of "some" because of the "of" in there but really there isn't really a proper translation for it. It's just something you have to use in Italian, which you don't in English.