Eliezer probes Rivka's family identity and asks for a place to lodge. Rivka answers. Verse 27 begins with the word ויאמר (He said) as opposed to more specifically ויאמר אליה (He said to her). It's unclear whether he was talking aloud to himself, or Rivka heard Eliezer say the blessing to G-d.
So, in verse 28, it says that she told her mother's house (family?) כדברים האלה - "Like these things". I assume that's what the extra כ implies, that she didn't repeat the exact words.
Even with this, what did Rivka relay? It seems clear that she relayed that there was a man standing outside who requested food and lodging. But, did she relay anything from Eliezer's blessing? Did she hear that? Or is it possible that the verse containing the blessing is out of chronological order?
None of the Mikra'ot Gedolot commentaries focus on this.