if she's hanging out with dudes when she doesn't have to - having a few drinks, whatever...
she's lining up what might be her next thing... she's plan B'ing you. Which is fine if she's young and it's just for fun. Cause you're doing the same thing all day long lol.
However, if she's 32 and yall are serious... and she's chilling after work, be very afraid. You wouldn't do that to a girlfriend you wanted to be with longterm. she shouldn't either. Yall should be spending every minute together naked that you can. Every minute she's high fiving some punkass from work, she ain't blowing you.