Yeah it has probably more to do with dopamine immunity.

She felt it at that moment, and 2 seconds later it faded away because her brain is just so used to, not only it, but even bigger hits. The down would have been even worse by being reinforced by the fact that she was "supposed" to feel the high of fame/success, so you think about it not fulfilling you and it's just that even more depressing.

"Oh hey, this is nic-- and it's gone. Well that fucking sucks."