What is McCaskill afraid of on Haspel vote?

At first, Senator Claire McCaskill took a page out of her own playbook on the Haspel confirmation and said she was weighing both sides (read: Will my liberal donors get mad if I support Haspel).

But now things are getting bizarre.

Per a new tweet, she is outright declining to talk about the Haspel confirmation. What is Senator McCaskill trying to hide from?