Yeah No.
No that's' the cut and dry of it.
Why wouldn't this particular policy apply a duty of care to Hopkins? From the insurer's point of view that'd be lunacy, they'd be on the hook for ANYTHING Hopkins said.
A "Duty of Care" is standard legal definition, that you'll find in every insurance policy you've ever taken. Whether it's house/personal/car/libel insurance you have a duty of care to adhere to take reasonable steps when performing certain acts that may potentially harm others. It'd be extraordinary for Hopkin's contract NOT to have this.
You're asking me to prove that Hopkins' insurance, (which may or may not have had existed) has a clause in it that allows her to libel someone and she does not need to adhere to a standard principle of tort law?
You may as well ask me what unicorn tears taste like, or what dragon farts smell like?