What happened to Mrs Heaton?

So, whatever happened to Mrs Heaton? The children were sat waiting, doing their morning tasks when they began to realise something wasn't quite right; where was Mrs Heaton? The children searched the school but she wasn't to be found. We all met in the hall to think about what to do next when we heard a strange noise... coming from the sarcophagus! Mrs Cador gently opened the lid and.... well, mummified Mrs Heaton appeared!
What fun the children had!