How long ago did this happen? I agree that it sounds like you might have done too much too fast, but I also realize this was in the best interest of your fish to the best of your knowledge. None of us knows everything, which is impossible when it comes to best fishkeeping practices.
Here's an essential article that will help you understand the cycling process:
http://www.fishlore.com/NitrogenCycle.htm
Has she eaten today? Is she still swimming sideways? If she still hasn't eaten and is still swimming sideways, it's an emergency. I don't know if you'll be able to pull her through, but it would be very helpful if you provide the information the above posters requested so we can all try our best to help.
Did you
acclimate her to the spring water -- that is, first treating the water with a dechlorinator solution even though it's supposedly pure water, floating her in a bag or cup before putting her into it so there were no sudden temperature or other water parameter changes, then slowly dripping some of the new water into the bag? Depending on the difference in water parameters and temp, this might have needed to be done in reverse when you put her back into the tank. (Or did you use the same spring water in the tank?)
However, for next time it would be better, if you absolutely have to temporarily remove a fish from its tank, to use the old tank water so there is not such a drastic change in water parameters and temp. Mostly, you don't need to remove fish from a fully cycled tank, and partial water changes can keep a tank going a very long time without removing the fish.
Small water changes done gradually will not disrupt your cycle. A gigantic one, especially if you clean your filter and substrate with anything other than treated water or used tank water, will.
I hope this is not too much info and is helpful.