This can only mean one thing: Her client has sent someone a written description of the alleged attack that has a lot more detail than what has been reported by the media before now ... and the Senate Judiciary Committee has already done a ton of work to follow up on the details of that story.
Could that be in the original letter that Grassley does not have? If so how would the Judiciary committee aides know to interview these witnesses?
This whole thing is bizarre like false info is being put out on purpose.
If a testimony is submitted 48 hours as is typical, that would be a formal statement.
Rules are rules.