MY DRUG ADDICT FRIEND IS FREAKING OUT!!!

So my friend smoked weed yesterday for the first time in a while and is anxious all day and is supper paranoid. Is the high still lasting? What can she do to feel better? Can I help her? She also on a diet and hasn’t been eating much so could that make it worse? She also had coffee today, I’m really nervous I’m not sure how to help her.