Yve, it is easy for your mum to make such comments because she is so close to you and she looks at you "in that way". Perhaps she feels she is being helpful in some way? Whatever, those kinds of comments are so unhelpful.
As a regular Joe, passing you in the street, I would look at you and see a well dressed, thirty something lady and nothing else. If I took the time to scrutinise your appearance for some reason, I would see a tummy yes, but I wouldn't think anything of it. Many, many ladies have tummy's (I do at 7 stone 8lbs and a bag of bones. I even had it prior to my 11 stone weightloss due to birthing big babies) and that is just how nature has dealt with us. I would never look at you and think or say anything derogatory; not because I am not that way inclined but because there truly is nothing to think and nothing to say. I know that no matter what we say and how many times we say it, this will all be something that you have to come to terms with in your own time and way.
Please be mindful of how much weight you are trying to loose also. Even though I could not eat and my weightloss could not be controlled (by anything I did), I was chasing that "magic" number. I felt that 10 stone was a good weight to be, until I hit 10 stone and it wasn't enough. I was thrilled I could not eat because I could keep losing and fast. I could see the numbers drop on the scale and my rational brain could look at those numbers and know I was becoming too thin, but the body I saw in the mirror just didn't correspond. I can see it now though and I dislike it very much. I look like a small child and have been told as much. People visit us and look horrified when I open the door but don't want to say anything for fear of upsetting me.
You cannot diet the loose skin away Yve. Please, please take care. xx