She's obviously talking about post-grad life

• Holly Golightly:
  You know those days when you get the mean reds?
• Paul Varjak:
  The mean reds, you mean like the blues?
• Holly Golightly:
  No. The blues are because you're getting fat and maybe it's been raining too long; you're just sad that's all. The mean reds are horrible. Suddenly you're afraid, and you don't know what you're afraid of. Do you ever get that feeling?
• Paul Varjak:
  Sure.
• Holly Golightly:
  Well, when I get it the only thing that does any good is to jump in a cab and go to Tiffany's. Calms me down right away. The quietness and the proud look of it, nothing very bad could happen to you there. If I could find a real-life place that'd make me feel like Tiffany's, then, then I'd buy some furniture and give the cat a name!