Susannah doesn't like peeling potatoes. You and me both, girl that is obviously going to be blamed of witchcraft by the father of the year. So she should be rejoicing in the fact that she now has the ability to do something other than burn for a lie.
The mother thinks something is wrong as her daughter doesn't usually complain. Susannah, of course, denies that anything other than the task at hand is bothering her. Obviously no one by the name of Edward has done anything bad to her. Or, at least, she thinks her former boyfriend is a horrible person.
Heck, maybe he'll turn out to be a real bloodsucking monster by the end of this book.