It seems like security guards are pointless for the most part. They seem to observe more than they act.
She was about 5'3", slim and carrying no weapons as far as I can tell. Don't even think she had a protective vest on. Don't know what you expect her to do there. Malls though have much bigger burly men with thick vests. Perhaps they do more. Or maybe not.
I saw a bank in one of the smaller shopping plazas with a security guy sitting in a chair in a glass 4 x4 or so boxed entrance.
In another mall I saw a crowd huddled in front of a store as I was walking in from the mall entrance. As I got closer saw glass shattered everywhere. It was a jewelry store and police inside were taking pictures.
Another time walked into a general department store. Not a dedicated jewelry store but near the front entrance was their glass showcase of their jewelry. All the glass was shattered and yellow police tape surrounding.
Went to Walmart one time to buy skin moisturizer. Asked a store worker where they were. She walks me over and shows me and they are behind glass and locked. Same for a health food store. Some of their supplements are behind glass and locked.
There's obviously a lot going on out there.