Maybe it's raining. Maybe it's just humid (this is SG after all).
Maybe she's going out later and wouldn't normally expose this bag to random bumps and spills in a mall, plus it is supposed to rain tonight.
Maybe she wants to hide the bag a little right now, again because she needs it later, but is a little self conscious out in public.
Maybe she's traveling and it's the only bag she has with her, and, again, she wants to protect it.
Maybe she is bringing it to spa.
The point is, no way to know about someone's day to day life. I thought shaming wasn't ok in this thread.