Answer:
Selective attention.
Explanation:
Selective attention is the act of focusing on the most important information at a given time. There is a large amount of information being transferred daily and our minds need to filter out the information that is not important to us at that time.
This is what happened with Juana. When she first read the article it was not important to her, most likely she saw the heading and selective attention pushed it aside as unimportant.
After her mother was diagnosed with bipolar disorder, it was one of the articles her mind now picked as important.