Should I feel guilty for saying no to extra work on my day off?

I am scheduled to work from 5pm-12:30am, but I close and we normally dont finish until 1am-2am. I got off at 1am and didn't get to bed until 2am. They just called me at 7am on my day off, and asked if I wanted to come work today. Im guessing someone else didn't show up. I feel really guilty because I've worked with the lady before. The one who called. I told her I had obligations with helping my mom today. She was understanding, and told me to have a good day, but I still feel very guilty. Should i?

Should I feel guilty for saying no to extra work on my day off?
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