Companion Care Needed - Full-time / Part-time

My Mother is 63 years old. She has Bipolar type 2. She has some mild dementia-like features. Such as short term memory loss. She is a pleasant person but can get become quite depressed at times. She has had a difficult year. She lost both her husband and her home. I am looking for someone to check in on her on the days that I cannot and possibly do some light errands/ check-ins. I am presenting this to my Mother as a kind of personal assistant type of position. She has done similar work in the past. Companionship/rapport would be very important. She has a dog.