One of the things I've noticed these days Tabby2, is that people expect you to "move on" far too quickly. Grief doesn't work like that.
I didn't get on all that well with my Mum either but as I got older (I'm 72 now), I learned to understand her a lot more than I did.
When she died, in 1992, it was a full year before I could actually come to terms with her loss, possibly because we didn't get on.
12 months after she died, I found a tape of music she liked and just broke down and cried uncontrollably for an hour, in a way I was unable to do at the time of her death
There's not much you can do about grief, it has to take its time but eventually, it does get less and you find that instead of crying (or feeling guilty in my case ) every time you think of her, you begin to remember some of the happier times.
It took me over a year and of course your grief process may be quite different but don't listen to people who tell you to move on, do it in your own time.
It WILL get better, just keep your head up Lass, and try to smile now and then.