Apologies for vagueness, but I think the precise details are outing, and the gist ought to be enough.
A friend wants to take up a voluntary role for which she needs some personal references. She has asked me to be a referee.
I think she is unsuited to the role, and can't in good conscience recommend her.
She would disagree with me about her unsuitability (obviously) and feel hurt by the suggestion. But I know I am not alone in my feelings as her lack of a key soft skill has been commented on (to me, not to her) before.
I have tried to address the issue with her gently before, but either I was too subtle or she doesn't think it matters.
So now what?