Hello @Jason2689
I am presuming that you are co-hosting for an owner who does not wish to be involved in the messaging between you and guests?
If so then the owner of the listing needs to deactivate the notifications from her account. To do this, they need to go onto their account:
==>Click their profile picture
==>Click on Account
==>Notifications
==>Once on Notifications, they need to change from Offers and updates to Accounts just under Notifications)
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Scroll right down to the bottom until they see
==>Guest and host messages
==>Edit and then untick the boxes!
Hope this helps,
Joëlle