"You should not phone Siân now - she is awfully."
Translation:Ddylet ti ddim ffonio Siân nawr - mae hi'n ofnadwy o dost.
This was deleted from the course database some time ago. Unfortunately, it is one of the zombie sentences which are still waiting to be removed from the wider system - outside the course team's control, sorry.
ofnadwy o dost is a way of saying 'terribly/awfully ill'.