Name what actually happens at night.
Is she getting up to the bathroom three times, awake and anxious at 3am, wandering, or calling you? Write down what happens for a week. The pattern decides what kind of help is worth paying for.
Awake overnight and live-in are not the same.
An awake overnight caregiver stays up and is there for every trip to the bathroom. A live-in sleeps and is there for emergencies. Ask which one a price refers to, because families often compare two different things.
Start with the hardest nights.
You do not have to cover seven nights to get relief. Two or three nights of real sleep changes what you can do for her in the daytime, and it is easier on her, too.
Make the mornings easier as well.
A caregiver who arrives before she gets up takes the fall risk out of the worst part of the day. Ask what the first hour looks like, not just what time someone arrives.
Say the quiet part out loud.
If you are sleeping with one ear open in another house, that is a real cost, and it belongs in the conversation about what to do next.