The character of Ida Jungmann could be said to be the still point of the turning world for the Buddenbrooks family. Though the world outside may change, they have managed to weather many storms, maintaining their wealth and social position across successive generations. And Ida is very much a symbol of that stability. So long as she remains at the heart of the family, a loyal, faithful servant who performs her duties impeccably, then we can be confident that all is well in the Buddenbrooks' world.
But the Buddenbrooks family suffers a serious reversal of fortune, in time-honored tragic fashion. Thomas's business begins to go south, and they are riven by intergenerational conflict. It appears that the whole fabric of the family is falling apart. In the midst of it all, there is still Ida, as loyal and as faithful as ever. But even she isn't immune to the financial decline befalling Thomas's business.
The once-proud Buddenbrooks family experiences a disastrous decline in their fortunes, leading to Ida's being let go. There is something deeply symbolic about this poignant moment. It's the end of an era, of a time when they were a truly great family, with wealth and high social standing. But the forced departure of Ida, and all it represents, shows just how far the mighty have fallen.