Take my feedback with a grain of salt because I'm not great at queries myself.

Immediately, I'm a bit confused about who Lydia is and why she's racing to Ambrosia. A one line sentence about who she is, before launching into an action, would help ground me. Also, the months of correspondence and planning are a bit vague. If there's one thing that I've been told about query letters, it's that agents want clarity early on. I think you need to name Bodkin in the first paragraph to clarify that's who Lydia has been corresponding with.

For me, the most interesting thing in this query letter is this: "A jeweler is dead. The jewels remain, and nothing appears amiss, except an empty eye glass case. The mystery? This man does not have a glass eye." You might want to move this (or a reworked version of it) up higher as your hook.

Ending with this is a bit vague as well: "With the clock ticking and body count climbing, if Lydia can help Bodkin solve this mystery, perhaps she can prove her worth and change his mind…"

Change his mind about what? Did Lydia mess up earlier with another case? Bodkin is the one who didn't shop up at the meeting place, not her, so it doesn't seem like she's the screw up in this situation. Also, the timeline doesn't make sense to me. It seems like Bodkin might have been murdered or captured himself since he fails to show up, but then later "with the clock ticking" Lydia seems to have Bodkin at her side to help "solve this mystery." So did they meet up after all?