Alz and losing balance

I think my mother might be entering a new 'stage'.
I have read that loss of balance becomes an issue.
She toppled over twice in two days.
Once with my sister and she skinned her knees in the grass.
And today she was trying to line dance, something she loves to do but couldn't do it today. She ended up tripping over her own feet and slowly going down. Most people would have caught themselves easily but I guess when your brain isn't firing it doesn't move your foot over to stop the fall.