She’s hired to do some remodelling at Diamond Tiara’s house. However, her mother doesn’t want her to come in the fine ceramic bathroom and step on the marble tiles as long as she has muddy/oily hooves from working.
After being caught relieving herself in a plantpot, Spoiled Rich went and bought her diapers. She picked the adult foal kind, with added poofiness and cute designs, because they were the expensivier kind, and she didn’t want to look poor.
The thing with working on fixing stuff is that if you’re called somewhere, it’s likely because something is broken.
Barter is often a good option when bits are scarce.
Berry’s internal body plumbing might be suffering from leaking issues.