The sister of a woman who took part in the Kaddish for Gazans killed by Israeli forces has condemned the decision to drop her from leading an Israel tour.

Nina Morris-Evans was among a group of young Jews who caused outrage by saying the Jewish mourning prayer for 62 Palestinians who died in clashes on the border with Israel, despite the fact Hamas had acknowledged 50 of them were their operatives.

The 20-year-old Oxford student was initially allowed to still lead the tour for the Reform movement’s youth wing, RSY-Netzer, provided to she was mentored. But Reform Judaism announced last week she was being dropped altogether, with one organiser saying: "There is such a thing as going too far."

Nina Morris-Evans’s sister, Shulamit, has published on Facebook a letter she wrote to Rabbi Laura Janner-Klausner, in which she accused the Reform Rabbi of “reneging” on an earlier decision to allow Nina Morris-Evans to lead the tour.

Shulamit Morris-Evans accused her of showing a “lack of moral steadiness”.

Her letter said: “The basis for this reversal seems to have been informal conversations that Nina had in an unguarded, open-minded way with several colleagues, in which she was trying to understand and empathise with their point of view.

“These conversations were then fed back, unbeknownst to her, to the UJIA and somehow used as an indictment of her as ‘too impressionable and too persuasive’.

“The tactics and the conclusions both give rise to very queasy suspicions about the justice of the process and result.”

She also claimed that her sister’s participation was “evaluated and approved over a month ago”.

She said: “Either [Reform Judaism] are making a decision reflective of their own convictions and aren't brave enough to say so, or they are allowing themselves to be frightened away from their principles by concerns that are essentially mercenary."

She also condemned a statement Reform Judaism issued that spoke out against the abuse her sister had suffered.

“[Reform Judaism’s] self-congratulatory response, depicting itself “at the forefront of standing up to these kinds of bullies and abusers” falls rather flat when it is the choices of [Reform Judaism] itself which have exposed one of their own to a vicious and vitriolic outpouring of extreme right-wing, misogynistic glee – they have given an enormous fillip to the very people they claim to stand up to.”

A Reform Judaism spokesperson told the JC: "As we have a duty of care to all our leaders and participants we cannot discuss the details of this particular issue."

UJIA declined to comment.