Maintaining on not as much as expected...

So, I reached my goal weight after anorexia about two months ago. I weigh between 47-48kg and am 5'2. I gained the weight back by eating between 2000-3000 calories. I adjusted my maintenance calories to 1500 by working out how many pounds I had gained each week. However, I also started exercising about 3 times a week. Recently this has increased to 4-5 times a week (gym 3 times a week, plus swimming once or twice a week). I've also been decreasing my calories slightly (bad... I know) to 1300-1400 on days I don't exercise and 1400-1500 on days I do. I'm still maintaining: at my weigh-in today I was 47.4kg, although I was wearing clothes and it was 3pm, so it could be less than this. I'm slightly disillusioned that I can't eat as much as others who have recovered. Is my metabolism permanently damaged? I suspect you're all going to say 'eat more', but I'm absolutely certain if I did that I would gain weight, which I am not willing to do. I hate EDs.

Is there anyone else who also maintains on a small-ish amount?

Your BMI is still only 19.4 which, for a recovering anorexic, is too low. You're in the situation you describe, therefore, because the weight you're trying to maintain is unrealistic.  You can only maintain this weight with very low calories and a lot of exercise.  It's an unnatural weight for your body.

The average, reasonably active adult female can maintain her weight on 1900-2100 cals a day.  You should increase to 2000 cals a day and let your weight naturally float upwards until it gets to a point where it stops.... Could be you end up 3-4kgs heavier, that's all.

So yes... as you rightly anticipated.... 'eat more'.  Also, 'expect to weigh more'.... Otherwise you're condemned to a lifetime of malnutrition, picking at tiny amounts of food and never having any energy purely to maintain some mythical 'ideal weight'.  Which is no life at all really.