Jim,
So Helen Shapiro is "repeating propaganda" that was being spouted by traumatised and wounded patients she was treating in the hospital -

No. She was an early 60s pop singer.
Nurse Ellen Siegel did not treat any such victims in her hospital in the heart of the camp.
On the second day they were visited by a film crew, the Red Cross and an Ambassador. No-one was aware of any massacre then. The first she knew was when she left on the morning of day 3.

are you dismissing the word of a Jewish nurse because you are an antisemite?

I do not dismiss her word. I accept her journal as an accurate account. It supports Israel's version of events. She testified to the Kahan Commission.

The finally agreed figure from Jenin was 53 Palestinian dead, most of whom were civilians

That has been disproved. It was the original lie.