Currently, It seems shapeshift and blockchain.info is having a problem with exchanging of coins. There are a significant number of people here who have posted a similar problem like yours. If you want to look, It's in the Web wallets and Exchange Boards
Try to follow it up on their social media sites below:
Facebook: https://www.facebook.com/shapeshiftexchange [Tagged as "Typically replies instantly"]
Twitter: https://twitter.com/ShapeShift_io
Reddit: https://www.reddit.com/r/shapeshiftio
To add-on, They've released the current state of their support queue and as expected it's not a good situation for you. Response will probably take a week or so.
Read it here (Tips are also included): https://www.reddit.com/r/shapeshiftio/comments/7layhk/a_note_about_the_current_state_of_the_ticket