I'm a heavy smoker an smoked a lot (marijuana) 3 months ago but only a couple times these past couple months an got to hair test in a couple hours... am I screwed??

An I'm a girl with long hair so I can't shave my head

I think you already know the answer here.

I'm a heavy smoker an smoked a lot (marijuana) 3 months ago but only a couple times these past couple months an gotta hair test in a couple hours...am I screwed???

Not necessarily. The length of your hair should not be a factor but the growth rate could be. In addition, marijuana users always have about a 40% chance of non-detection due to the properties of THC-COOH* that doesn't readily incorporate into hair.

Only about 60% of heavy daily smokers are detected via hair testing. So depending on the collection method (how close they cut to scalp) and how fast your hair grows the heavy use period could be detected or completely missed.

*the only metabolite used to confirm