Sounds like nute burn but were going to need a heck of a lot more info. Soil or hydro? Chemical or organic, cycle info Ie:veg or flower? Put a pic up bro let us see what your little girl looks like. She could have a runny nose or full blown gongabegis, we cant tell from your description. Don't panic she can't be all that sick but heck what do I know I am just a dumbass musician with a penchant for cannabis in all her forms. Peace