amount of calories/not starving

Hey! So i have a rather weird question maybe, but I had my goal on 1200 calories, and I ate back my exercise calories (300-600 a day). It's not much but I wasn't starving myself AT ALL! Most days in the evening I had calories left, so I would eat more to give my body 'fuel'. In the first three weeks I lost 6 pounds but after that I regained 4 (not doing much differently, I ate more bad things in those weeks but always within the calorie goal). My question is, am I doing it right?
My mother says that I am eating really well and that she can not believe this diet will actually make me lose weight. I know you're not supposed to be starving yourself, but I do feel like this is too easy and the weight gain of the last weeks kind of confused me.

This is what i normally eat:
breakfast: 150 calories
snack: 100 calories
lunch: 200 calories
snack 2 o clock; 150 calories
snack 4 o clock: 150 calories
dinner: 650 calories

then depending on the day i have about 100-400 calories left, and this is very roughly taken, but it's an idea

please only comment when you want to help me, I am not looking for negative comments.

thanks!!!