Final answer:
Penelope would primarily be motivated by social needs according to Maslow's hierarchy, as her physiological and safety needs are met, but she lacks friendships and positive social interactions.
Step-by-step explanation:
According to Maslow's hierarchy of needs, Penelope, a high school teacher, would primarily be motivated by social needs. This is because, despite making a good salary which satisfies her physiological and safety needs, she is experiencing difficulties in establishing friendships and getting along with her colleagues at work. The need for belonging, friendship, and social interactions falls into the social needs category, which is third in the hierarchy of needs, above physiological and safety needs but below esteem and self-actualization needs.