I did, multiply times, every time I ask her she says she believes I can find out by myself.
I tried to listen to the girls gossip, they never mention her measurements.
I also spent like 5 hours on loading the same hotshots save trying to get a question about her waist size (because there are questions about her other measurements), nothing works.....
You never said why you want to know Amy's waist size. I'm guessing it is to buy her something like her sling bikini or complete a doctor's quest. Here's the thing, that has been explained numerous times already, for the latest update (0.1.9.0) all of Amy's stats were reset to
Affection=35 and Love=35. You cannot change them with the mod or a console cheat code. The only way to find out her measurements is to ask her, but unless her affection and love are higher, she won't tell you. So how to raise her stats? The latest update has a bunch of new quests for Amy, that once you complete all will raise her stats to
Affection=100 and Love=75. Those levels are high enough for you to get her waist size. So start the new quests by seeing Amy in the gym and go form there. Incidentally, one of the quests will actually give you her waist size. Good luck.