I'm concerned about my mom? She has been up every night at 3

Not unusual. It's not unusual for aging parents to have disruption of their normal wake sleep cycle. This advancing usually ends up with going to bed earlier and waking up very early in the morning. Try to avoid daytime napping and have your mother stay awake a little longer each night before she goes to bed. You can reset the cycle but it takes time. Bright lights in the morning will also help restore normal.