When you think about management, especially upper management, the words that come to mind don't tend to be, 'kind', 'warmhearted', 'generous', or 'wholesome'. But in this case, an employer proved that some bosses are more involved in their employees personal lives than you'd think, but in the best way. OP had a few health problems and had a surgery scheduled to treat them. Unfortunately, OP was then informed that the surgery cost way more than she'd initially expected… which made OP cancel it. What could she do? She simply didn't have the funds. She didn't want to be in an enormous amount of debt.
That's when OP's boss intervened. She approached OP, asking why she was at work, when she'd asked for a day off for the surgery. OP explained to her boss the situation, and to her utter surprise, her boss offered to pay the full amount. OP then took to Reddit, asking for advice on a proper gift she might give her boss, as a thank you.
For more, here is a thread where women discuss reasons they broke up with a perfect partner.