Mum thinks i'm too skinny

I've got this problem, I've lost 10kgs in the past 10-12months and I still think I should lose a bit of weight but my mother thinks I am too skinny and I have changed a lot, I am not as fun as before (I live abroad so she sees me every once in a while for a few weeks) etc and she says she doesn't want me to lose any more weight. Also she tries to make me eat more, which really pisses me off because I worked so hard to lose this weight and I'm scared to get it all back, even if I accept not to lose more weight. I am between 1m75 and 1m78 tall and I weight around 58kg. Do you think I am anorexic or is my mother exagerating a bit like all mothers? I don't think I eat that little (my mother doesn't think I eat too little either but she's scared I'm just limit) but I accept that I am really exigent (?) with myself and I'm not happy if I am not perfect... What can I do to be happy with what I am? Any magic trics?

Here's a picture of me just so you can have a rough idea of how I look. I have that little tummy as you can see and it seriously pisses me off!