Ms. Dunbar

Hint 1 of 5:

Dunbar seems sweet and all, but there's something else to her.

Hint 2 of 5:

First, if you find the fragment of porcelain in the garden, you'll see that
it has medicine on it-medicine which she takes.

Hint 3 of 5:

And if you accuse her, she'll drop a ticket.

Hint 4 of 5:

Through some inquiring, you'll learn Baxter and Dunbar are dating.

Hint 5 of 5:

This means that they could be in cahoots.