Mom guilt/Mom shamed

I’m a divorced single mom and haven’t been out in 4 years. I work from home with him here bc childcare is full here so I am mainly with him 24/7 ,which I don’t mind. I’m seeing someone now and spent a night away from my son for the first time mother’s day weekend , and my mom has been shaming me every since. Calling me a bad mom , saying i’ll reap what I sew and she hopes someone beats my son up next time I go somewhere without him. I wasn’t even gone long, I left 5PM Friday and came back the next morning. My mom doesn’t watch him, help me or anything at all. Im completely on my own with him so Idk why she cares. &If I were to ask her to help with him for an hour she would say no which is ok. My son stayed with his cousins and had a great time ,says he can’t wait to go back. I help my cousin with her kids all of the time ,she’s always asked to let her watch him while I enjoy myself for once. I feel so bad now & thinking about cancelling my bday plans in two weeks bc I just don’t want to hear her shame again. How often do you moms go out without your kids?