If it's a small bitch from a line of tall irish coursing greyhounds the chances are that most of the pups would grow to the same size as they would have done if bred from a tall bitch. Genetically irish coursing hounds are tall and back breeding would mostly be dominant, whatever the size of the mother.
The occasional pup might well take after the mother in size but it wouldn't be easy to predict which one.
Personally I do like a rangy one so it wouldn't worry me either way.