Good thing that having almost 500 years between Dean/Amanda and when we actually get good Dean/Chloe means that Amanda didn't exactly put 2 and 2 togeather.

Plus, Chloe was dangling sparkly jewelry around. Which is Amanda's true love. Amanda+sparkly jewlery = Otp. If she had to choose between the Kryptonian bracelet and Dean, I think she'd go for the bracelet any day. XD

Just don't tell Dean that. It might hurt his pride.