This has been the case since day 1, she have ALWAYS dropped only 2 crap items.
This is not why you kill her though.
You do it for the “Feel Good” moment of killing the hardest boss in the game, along with a pretty cool horse and a title. Thats it and always been.
Funny how you say “Knows issue since 3 weeks” when this has been the case since over 12 months.
BTW what did you expect her to drop?
There are bosses for target farming whatever and uber uniques, Blizzard have been pretty clear and generous of the info on were to go to aquire certain items, Lilith is not one of them outside of what i previously mentioned.