It's bad to ignore a person without explanation.
Renee has a big test coming up.
Renee wants to focus on studying with no distractions.
Renee lets her friends know that she needs to focus for a few days and won't be as responsive.
Renee stops answering texts and other messages from friends, so she won't get distracted.
Renee's friends understand and give her time to study.
Renee's friends worry about her and feel hurt that she is ignoring them.