Given that Radhakrishnabai was a Brahmin, wasn't her service of sweeping the paths for Baba considered highly prestigious and honorable by others?

On the contrary, the source material from Chapter 35 explicitly states that this service was considered 'menial' by conventional standards. The text highlights the remarkable nature of her devotion by pointing out this very contrast. It notes that although she was a 'Brahmin, worthy of worship by all,' this 'dullness of thought' about the work being lowly 'never touched her faultless heart.' She would wake early and take a broom in her own hand to clean Baba's paths. This act demonstrated her profound humility and the purity of her service, which transcended societal notions of status and honor, making her devotion truly blessed.