Come to the baby shower with no gift?

Is this rude? Like why come with no gift then be eating the whole time and not wanting to play games then leave early? How would you ladies feel?

It was my sister she has 2 girls never does anything for their bday I always do they are 9 and 10. And she is so mean to them I wanted the kids to come so they could eat but she came too. She wasnt invited