Well I have some good news. I used a cotton swab to pick out all the gunk in her nose and she hasn't had a problem since. Also I had hot water mixed with uncooked carrots into her dry food so now she eats it all up.
She is running around chasing me again and wanting to run when we go out on walks now, but she still doesn't want to play fetch.
Thank you for all your help! (I do think turning the air conditioning off at night did help)