Dollar General complaint: Two faced

I live in a small town, we just got a new dollar general in late last year, the staff and building is wonderful, my main concern would be the older woman. From how she acts, it would seem as if she’s the manager, she complains that she dosnt have good workers, or that she has to do all the physical work by herself. The few times I’ve gone in during the latter hours, the wonderful girls who are there are very polite and hard working, which confuses me. I’ve asked a few workers if she’s like that all the time or if I caught her at a bad time but they both said she’s usually worse than that and I’m not happy with the way she was talking behind their backs, aside from the two girls at night there’s two other workers too, I’m pretty sure she’s talking about them behind their backs too. Over all she seems to be a two faced woman. I worry about the other employees seeing her lies she spouts behind their backs.