Any activities for mom? She seems worried and wants us next to her always.

I believe mom very advanced with dementia, doesn't care for anything but walking with no purpose and standing and holding my hand. She can only say 3-4 words that make no sense.
My mom doesn't know my name or who I am, but knows my sister and I are someone who love and protect her. She is very frail weighing now about 72 lbs, but petite and always small, seems there's been a big advance in only 6 months, not knowing anyone in pictures or caring about children or animals as she always has.
She is not aggressive, but seems worried and wants us next to her always.

Wondering what to do to pass the time as I know she must be very bored. We do balloon toss and sing, forgetting words, so sad. I hate to say, but my sister and I are also very tired, but do the best we can and am thankful there are the 2 of us to take a shift so to speak. I did this for a living but not 24/7. She seems to prefer me to my sister, I am slower and take things quieter.
My Moms diagnosis is protein calorie malnutrion if anyone knows anything on this. We pretty much live on Ensure plus and water or gatorade for fluids.

Sorry to ramble, thanks for any advice.