Why did this girl go dark?

Other than the simple explanation that she found someone more attractive midway through the exchange of messages, I can find no other reason why this girl went dark on the dating website Plenty of Fish. Here is copy of the message exchange:

Me
Hey, how about Starbucks!

Ariel
Like go to starbucks?

Me
Absolutely!

Ariel
Let's do it


Me
Tuesday (tomorrow) past 6:00 or any time on Thursday.

Me
We'll make it the Starbucks in Port Jeff, (201 Main Street) or if wish, or even better, The Steam Room, right next the ferry.

The available times are (also in previous -email) are either tomorrow past 6:00 or Thursday (any time).

Other then she found someone she thought was a better 'catch'????? What other reason do you need?

It's Plentyoffish... go reel in another one... there's plenty.