olivia is so good. hallucinationcent's voice & mannerisms almost feel like a caricature of alicent, but it's still subtle enough that you don't fully clock the difference until real alicent shows up & hits you with 1 word that reminds you "oh yeah THAT'S how alicent speaks".
I always thought this scene was interpreted backwards because if Kim was truly spoilt, she would not care about losing $75k diamonds. Caring about losing such an expensive thing indicates she understands its value even if she is not significantly impacted financially by its loss.