I guess it depends on whether you want to be polite, or just stop her....sometimes there IS no polite way, as the person feels it is their right to be heard by 'you'........you 'can' try, "Masie, you just seem to be really upset about things....shouldn't you try bringing these things up to those who can do something?" and if that fails.."I just feel really uncomfortable hearing all this....please let's keep our discussions on necessary things."