So sorry for such a traumatic loss plumseverywhere, and for the loss of Martha, ladyluck.
A very upsetting time for all concerned
cpd encouraged I went on a pet bereavement course which went into depth about helping pet owners and other household pets.
The one thing that was shown to help through most animals was allowing them to see the body. This also helps with children. It helps both come to terms easier than the deceased being there then disappearing. They still bereave but it helps them recover from this state correctly.
It also helps to change routine slightly sometimes.even simple things like feeding in a different bowl in a different area, going for walk out of normal routine etc.
Hope this helps in some way. ((hugs))