Ok, your problem is that she's in an uncycled tank is probably very poorly by now. Please click on the link in my signature, this will take you to the Beginners Resource Centre. You need to have a read through of everything there, but especially the article about
FISH IN CYCLE.
Can I ask how long you have had her for? Also, how often do you do water changes, and how much? With your new tank, if that is not cycled then you will also be in a fish in cycle with that too. This means that you need to be doing daily water changes (at least 75%), otherwise she will be swimming around in her own waste. This will very quickly poison her, and cause massive health problems and will quite likely lead to death. You need to be doing this for your new tank too, otherwise you will start loosing fish.
Water test results mean testing your water to see what levels of Ammonia (very toxic to fish, and is caused by their wee and poo), Nitrite (also very poisonous), and Nitrate. You need to get yourself one of these:
API Freshwater Test Kit. They're about £20 online, and I cannot stress enough about how important it is you get one. You need to test your water daily, and if the Ammonia or Nitrite are above 0 ppm then you need to do a large emergency water change with dechlorinated water.
Can you do a big water change right now (at least 50%)? It'll help her out a lot, otherwise the chances are she might not make it.
Please PM me if you need help with anything, I'd be more than happy to go through anything with you that you're unsure about