The woman then describes how she murdered her son, without giving the audience any clear motive for the act, but presumably because she knows that it will cause her former teacher pain even though it is clear from her descriptions that she also dearly loves her child.
The woman then describes how she murdered her former lover, without giving the audience any clear motive for the act. In the televised movie version, the woman murders her child because she knows that it will cause her former teacher pain even though it is clear from her descriptions that she also dearly loves her child.