Final answer:
The caregiver watches for the resident's facial expressions to assess if they are in pain, as it is a valuable non-verbal cue for pain assessment.
Step-by-step explanation:
The caregiver in the Range of Motion video states that she will observe facial expressions to determine if the resident is experiencing pain. This is because non-verbal cues, such as facial expressions, can indicate discomfort or pain in a patient who may not be able to communicate effectively. Monitoring facial expressions is a common method for assessing pain in patients, especially when other forms of communication might be impaired.