My cousins test came back " dilluted"

I went to a head shop and bought her the XXtra clean drink for women shes like 5 foot and 105 tops and she called me like 10 min ago and said her employers called and said her test was dilluted. She only smoked a couple bowls of lambs bread and took her test 7 days sober, and she only puffed a few fridays when she came over shes has now been 18 days clean and has to retake the test, you guys think she will be fine ???