After running off the dragon at Thundertree, Vala pulls a card, hopefully, thinking perhaps she had misunderstood and Venomfang was the corrupting force she dreamt of, , but she pulls The Devil immediately, which she assumes represents Hamund Kost, or more generally, the Thay.
She believes the party will survive the trip to Cragmaw Castle, but is uncertain about her own life. It makes her all the more certain that Sildar needs to be allowed to choose to be there for the assault or not. For Gundren's sake.
Gundren has been saved with Sildar's help, Vala and the rest of her party live, even Rig has been returned. Vala continues to pull The Devil. She is realizing it truly represents the threat her Papa continues to be, even in death, and if the figures chained beneath represent herself and her Unnamed Betrothed.