She did say they use "AutoNation" and they typically give lowball offers anyway. I called my Toyota dealer, they are offering in the $28K range, for my $40K 2012 Advanced PiP, it has 10,500 miles on it, more than $1/mile
The Edmunds site has it listed for $33K or so, but its a tough market, Toyota is giving $5K off MSRP to start right now ($35K for a new 2013 with no miles on it), so the dealers offer is probably close. If I had the same or similar offer from Tesla, I would prefer that to save the %6.25 MA Sales tax on the $28K for the trade, that's another $1750 of savings. I'll ask again, can't hurt.
EdA congrats on the delivery, looks like the same color as mine (Dolphin Grey, or it could be the dark blue, hard to tell with those upside down pics)