You must allow your mum to do what is right for her. For some bereaved people, some things are just too difficult to face, this is one of them. Almost three years down the line, I still haven’t scattered DH’s ashes. Initially I couldn’t face it, then I couldn’t make my mind up where or when so I still have them. Sometimes it’s a comfort; sometimes it feels like a millstone round my neck and I wish we’d got it out of the way earlier. My children used to tentatively ask whether I’d had any thoughts on the matter, but now they seem to have accepted the status quo. Perhaps, when I go, we’ll end up being joined together again on some windy headland somewhere, but it won’t be my problem!
Be kind to yourself and your mum. It’s a difficult time.