help me please!

ok so im 5'4 and 110 pounds. Im pretty active, and eating 2100-2300 calories a day. I should be maintaining/gaining, but I keep losing weight! My parents are furious with me and dont believe Im eating as much as I am! (recovering from an ED) 

im so scared to eat any more calories/day,...but should i? also im going to boarding school next year and am afraid my eating disorder will come back? PLEASE GIVE ME ADVICE! has anyone else been in my position before?

If you're still losing weight and don't want to be, then go ahead and eat more.  If you start gaining more than you want, then eat a little less.  You need to find out what works for you.  You may also want to go to a dr and get tested for a medical condition like hyperthyroid.  In the case of something like hyperthyroid, it's not just that you'll lose weight, but there are also other very serious complications so it's important to get it fixed.

get checked for hyperthyroidism.

But you are 14 yo, and growing,  eat more!! especially if you are active.  You say you are pretty active, so I guess you burn 200-500 calories a day with cardio or such in which case you are NOT eating maintance for you age.  When I was 16 yo I ran cross country and could shovel away 2,800-3,500 calories a day and was still 125# at 5'7".  So TRY eating more, you will not magically get fat overnight.  Just up your cals a 100/day for a week and see if you are still lossing.  If the answer is "yes"  then up another 100 next week, until you find that balance.  It is so important at your age to eat.  (i struggled with ED at your age BTW) 

Measure everything.  You might be under-calculating your calories by a couple hundred each day, which could lead to a loss, instead of maintaining.  Also, it could be possible that you had a temporary weight gain before you tried to actually start gaining (sodium induced water retention, TOTM, maybe?) and now are just losing that, but not actually losing weight.  That would depend on how long you've been at it, though.

If you're sure you're not underestimating, or just fluctuating a couple pounds, eat more.  If you're worried, talk to your doctor.  Good luck. =]

My guess would be that maybe you've shocked your metabolism back into existence plus now that you have a healthier deficit your body wants to let go of the extra lbs it might have been clinging to when you had your ed.

But then I don't really know what exactly I'm talking about so it really is just a guess :P