1- It’s permissible not to have to children, but it’s not recommended. Islam wants us to have children and make the effort to raise them. We must sacrifice. It’s worth it.
2- It’s permissible not to get married as long as she guarantees she won’t fall into sins and she can guard her chastity. She should not let her that bad experience ruin her life. There are good men out there and she can make the effort to know someone good Insha’Allah.