All the members turn good? I highly doubt that ^^.
Are we sure we aren't all reading too much into her scenes and she's just super confident in her abilities anf really wasn't in the mood to fight? ^^
That would have been enough if she hadn't done anything at all. What's peculiar however is that it were Natsu and the others who started a fight by beating up her soldiers. Then when Marin beat up Mest, they didn't want to let it go and then Brandish presumably killed Marin to be "even". So in the end she lost one of her men and several others got beaten up, while FT only had one person being beaten up despite them having started it all. It's not that FT got away easy there, it's that they got away completely with everything.
So yeah there was something weird with Brandish' behavior that can't be explained by just confidence in her abilities.
EDIT: I just checked FT Monthly Magazine and apparently Bisca dislikes sweets, while Brandish loves them. I always went with "Visca", but if you use "Bisca" then you get Bisca, daughter of Brandish...
Might be a tad more plausible after all.