Whats is wrong with my cats face?

She had swelling of the eyes a few weeks ago but never acted as though in pain. then it went away in 3 days. now her lip is swelling. ive never had a pet with allergies. whats wrong with her is she sick? no other symptoms just random swelling on random parts of her face. no hair loss hair vomit excess pee. im thinking it could be a new air freshener her new cheep litter or stress. she never seems in pain and she acts out when she is. it could be new laundry detergent because i ran out and had to borrow some from my grandma till i got paid and it was scented and i usually use no scent. or maybe a mix. what are some common house hold allergies for cats. the air freshener had ethanol and was renuzit. the laundry detergent is erra and it was vanilla lavender and the cat litter was special kitty has any one else had problems with these brands?