Elizabeth, a 15-year-old with severe disabilities, has learned to make a bed at school in the bed-making program. she is unable to make her bed at home, however, most likely because

I believe the answer is: she cannot generalize the skill from one environment to another.

In this context, generalization refers to the ability to modify the skills that previously acquired in facing various problems in different scenario. Due to its use in multiple settings, This ability usually made as the main purpose in every functional based curriculums.