RRR - yep - sounds like a classic case of 'Mother-Foot-in-Mouth' - she's your Mum, she's allowed to say what she thinks, without actually thinking it through first didn't ya know ...
If you are being honest with yourself, when you look in the mirror, can you see that you have lost weight? You have probably lost around a stone, with another 4 to go, depending on where you have lost it from already, it probably isn't that noticable.
Maybe, what she was trying to say, in an arse about face way, was that you are putting in a lot of effort, for seemingly little return, are you sure you're doing this the right way...
Try to look at it from another point of view, if you were doing something else - say, painting the house and putting in this much time/effort but had only done a small amount and your Mum thought that for the amount of time you had put into it, you deserved to have painted more than the skirting boards, you wouldn't take offence would you, you would simply point out that if you used a roller you'd be almost finished, but that with your 'lovely new tiny brush' it will take longer, but the result will be fantastic and it will last forever... you wouldn't be upset though would you, you would just tell her why you are doing it your way and why the result is better and in the end if she didn't agree - it wouldn't matter. It's the same with weight loss, it's just we are really sensitive about it.
I say we, as I need to lose as much as you. The difference is, you are doing something about it - and I'm not!!
You are doing well, you are doing it the right way and more importantly, it's making you feel fab while you are doing it - not tired, starving and cranky!
Let us know how you are going from time to time