Answer:
Hilda is trying to extend her personal space so others do not invade it.
Explanation:
Personal space refers to a close region surrounding the individual which he/she perceives as his/her personal area, as psychologically hers/his. In case someone crosses this area, the individual can become anxious, nervous or angry. Having this area to him/herself provides comfort to the individual.
In this case, Hilda is extending her personal space by placing her things (coat, books) in her surrounding area, making sure others do not invade and cross this line.
