Does Exstacy make you Instantly thin?!

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Yes and no. The stimulant effect can make an individual pass a substantial amount of fecal matter that may have been sitting there for a while. On a side note, it is possible to burn more calories than normal just by doing nothing while under the influence due to an accelerated heart rate. The higher the heart rate the more calories are burned.

Seems alot of people overlooked the 'chemical' side of this question. Ecstasy (MDMA) is a psycho stimulant (Methylenedioxymethamphetamine) as its part of the amphetamine family of chemicals and acts as a stimulant, it will decrease your appetite. You will have little to no interest in eating whilst under the effects of MDMA.

That combined with dancing will in turn cause you too loose weight. I lost about 3kg in a single night from a few pills + dancing.

Any stimulant will reduce your appetite, hence why people who drink coffee (which contains caffeine) religiously don't appear too eat as often as people who don't drink it.

The amphetamines in MDMA dehydrate you, making you look way skinnier and of coarse you don't eat on X either so it is probably a combination of that. It is also likely that she is using other drugs too.

Ecstacy doesn't make you lose weight, all the ensuing activity does (ie dancing). Most of the weight you will lose is water from sweat and dehydration. Without dancing weight loss is minimal.