I think you’re very responsible for making a careful decision about whether or not to have children. There are plenty of valuable ways you can contribute to this world and it absolutely doesn’t involve having babies. Your mom is just thinking of herself. I don’t think you need to cut ties with her... not if the relationship is otherwise good. She will have to accept and respect your decision. Maybe she would be willing to join volunteer activities with you if she feels like she needs to fulfill her need to care and nurture others? Maybe she would not want to do that... but it makes sense to me that you would find fulfilling and meaningful activities if you felt something was missing...