yeah, but it's only 1 week. Their weight gains can vary enormously week to week, so unless there are other signs of immediate concern (floppy, listless, dehydrated, etc) then it's best to wait it out for another couple of weeks and see how it goes. She's over 2 months now, right? From the 3-month mark (or thereabouts) the weight gains do slow down a lot.
At DD's age the weight can tend to plateau, so I'm not concerned. She seems fine to me. Also it was a different set of scales, so it may be that she's gained a little bit.