No, it is definitely not a sauce bowl.
"The Art of Carnival Glass" page 100 - quote:
"Sauce - a small bowl that is not ruffled (or the sauce would simply flow out)."A sauce does not have ruffles.
Your bowl, Della, is a small ruffled bowl. You could certainly call it a small berry bowl, as it was most likely made as part of a full set comprising master berry bowl and 6 individual small "berries". The number of ruffles aka crimps can vary. The two splits sound like they may have occurred during cooling.
It's a pretty piece, Della, by the way
