RISKING LOSING CHILDREN! PLEASE HELP!!?

I honestly have "a friend" who's daughter is 24 and needs to take a urine test because the father of the child claimed she was a bad mom, which is not true. I've heard tons of ways to p (she smokes pot and doesn't have enough time for it to be out of her system). The drinks don't work! I've witnessed it several times. If this girl used an older womans urine, would it show that shes in menopause or anything like that? Someone suggested filling a condom with "clean urine" and using a pin to squeaze into cup. She has to keep it between legs for room temp. right away and hope that it is not a supervised test. I know that works if done correctly, but what about the older woman's urine? Any other suggestions or knowledge would be helpful to a good mom who relaxes with marijuana sometimes. (I hate the stuff myself). Thanks.