Stories like this are really hard to swallow. And let's just say that having good intentions doesn't always come with a good outcome. Helping her sister with her kid's school fundraiser was an act of kindness and pure love, since events like this often involve a lot of preparation and time from the volunteers. She not only offered her time, but she also bought some stuff that was going to be sold later.
Now, she had in mind maybe working on setting up the event, looking after her niece and nephew, nothing more than that. The fundraiser went by, and everything was excellent. However, things totally changed the following weekend, when the woman received a text from a random number asking if she was going to be available for babysitting next Saturday.
She was confused and later realized that one of the prizes was a date night basket that included four hours of free babysitting by Aunt "Her". This meant that her sister had put her inside the prizes without telling her, and the whole thing was sold for $210 that were going to the school. So, essentially, she had to sacrifice a Saturday night for nothing.
Of course, we can imagine how upset she got, and she called her sister right away. She told her that this wasn't part of the agreement, and that she was not going to spend four hours looking after kids she had never met before. This caused a big issue with her sister, since she either needs to find someone willing to babysit those kids or tell the school she included something in the auction without actual permission.
To make things worse, her sister got mad because she embarrassed her and is forcing her to do it because the money went to the school, so it's not like these people can get it back. With situations like this, it's worth being more mindful and careful not only when offering to help with "whatever is needed, but also when volunteering our family members to do things they don't actually want to do.