Welcome to the forum. If you only let the temperature adjust, you may have shocked her with the new water. Water isn't just "water." There are differences in pH, hardness, etc. So it's always a good idea to acclimate fish to new water before letting them into the tank.
There are many ways to do a water change and acclimate (reintroduce) your fish back into the tank. Here is one variation that can be done whenever you need to replace the water in the tank:
- Note the temperature of the tank water.
- Using a plastic cup, scoop her, along with some of her water, into the cup.
- Clean out the tank. Refill with water at the SAME temp. Be sure to add the correct amount of water conditioner.
- Float the cup in the tank for about 15 min. (This equalizes temperature.)
- Add a SMALL amount of NEW water to the cup. (Several tablespoons, or about 1.5 ounces.)
- Let the cup float for about 10 min.
- If the cup starts to fill too much, remove a SMALL amount of water from the cup. Discard it.
- Repeat steps 5-7, until about an hour has passed. (This allows her system to become accustomed to the new water parameters.)
- Gently release her into the tank.