I will offer the (late) advice I also offered to the gout-stricken pee-drinker, re: risk reduction.
Have her pee, then drink a lot of water. The resulting urine will be, well, mostly water, without much actual waste products, and thus (presumably) less tamoxifen as well.
Have her pee, then drink a lot of water. The resulting urine will be, well, mostly water, without much actual waste products, and thus (presumably) less tamoxifen as well.