Companion Care Needed

I'm looking for companion care for my mother in her 80s. My dad is her primary caregiver. He needs help keeping my mom busy. Physically she is pretty healthy for an 81-year-old. She likes to walk and keep busy. Mentally she has dementia. So, we are looking for someone to be a companion to her, take her places and have fun interactions with her. Reliability is a priority. We are looking for someone to start with Monday afternoons and Thursday mornings-afternoons. She does not need help with meals, bathing, dressing etc. We are looking for someone who would take her to shopping, walking in the park, just getting her out and about.