A little while back Meeka was coughing about once a day. I thought she was trying to bring up a hairball but after about 4 days, I got really worried nothing had come up and took her to the vet. She had an infection. She was given a shot, and some antibiotics and it had cleared up within about 5 days after that. Samson started coughing the day after we took Meeka to the vet so the next day, in he went as well. It was obviously contagious and he was given the antibiotics (no shot for him) and within a few days, he was better as well.
They were both otherwise fine within them selves, eating, drinking, playing with the kitten. Nothing changed except they had abit of a cough. It was an infection though so I highly recommend you have it checked, even if she seems fine otherwise.