as long as the water is clean, you aren't adding new treated cold water then it'll be the same temp as what your house is at. make sure there is water flow with a bubblier or small filter and you'll be fine. i do it to my fish when they are sick.. just easier then putting up another tank.
if it is infected then it can progress to become worse. if you don't have real plants then treat with methylene blue (its my #1 go to) treated almost everything.. make sure that the water is very clean and give her some time. oh and remove carbon. just make sure that the other fish you have wont be effect and or you can put her in the bucket etc instead of the male with some cover plants and water movement.. keep the water clean and it'll be fine.