I found out what Tympany is or was...for one thing the Curate didn't spell it properly did he...that didn't help one bit. But I remembered I have an extensive list of historical names for diseases...sorry.
Tympany was a 'bloated distension of gases' it sounds pretty grim...'the belly would bloat until it was as hard as a drum' quite why this caused the poor woman's death I don't know...it could have affected the internal organs perhaps.
Thank you to everyone who contributed their ideas as to what it was.