My granddaughter sprayed loads of febreze and i now have sore throat and mouth and cough after breathing it in. will this go away soon.

Hopefully: She really may have caused a lot of chemical irritation. How much? that is the question that says she should be examined by her physician to see if any significant damage was done to the delicate tissues in the oral cavity & lungs.

It should resolve: within a day or two. Try saline gargles and humidifier. I think it is just mild topical irritation. I am not aware of any substances in air freshener that is toxic.

Hard to say: ...you don't say how long it has been going on. You don't mention heart or lung disease. Usually, just inhaling what is mostly perfume wouldn't cause anything dangerous to happen unless allergic, but of course you should get outside and inhale as much clean, clear air as you can, or go into an air conditioned place and do the same. If you have trouble breathing, throat swelling, rash, go to ED.