Hate my boss, but feel bad

Not sure if this is the right room to put this in but...

I have been with my job for 3 years now and I truly dislike my boss. She is narcissistic and only ever cares about herself and the top dollar. She expects the world of her employees and even expects us to clean up her messes around the office. She has us do personal errands for her and when confronted about it told us that she pays us so she can tell us what to do and it shouldn’t matter what the task is, just get it done (she owns the business).

Get this, we have the opportunity to work events on weekends if we want a small bonus ($40 for 9 hours 😑 we don’t get paid for the extra hours worked because we are salary). Well one weekend I told her it was my weekend with my son (I have 50/50 custody) and did not want to work an event. She told me that having my child that weekend is not a good enough excuse to not work an event (which mind you, are OPTIONAL!!!!).

Sorry, long story short, my coworkers and I did not get her a Christmas gift this year. At first I was fueled by fire and there was no way she was getting anything from me because she has been a dick to me at work lately, even in front of my coworkers. But then she gave us all $50 for christmas and I slightly feel bad no one got her a gift.

Should I feel bad? Should I get her a late gift? Or fuck it?