Hey Beatlesfan,
I think you've done a fab job - breastfed when it really wasn't easy for you - and you've done amazingly well to get to this point.
At the end of the day, its no-one's business except yours how you feed your baby, your mum can't force you to breastfeed, so she'll just have to lump it. I think I would tell her how you need her support right now, not her criticism (although I know I don't have this kind of relationship with my Mum, she couldn't cope with hearing something like this).
Well done and good luck with the transition - let us know how it goes with your milk drying up eventually etc. Is your hubby still helping with night feeds?
Valentine Xxx