> 1. How long do they live on average?
Average? Probably two years. But many make it to three. Not many make it a lot past that as the head of a strong hive as they run out of sperm.
> 2. Is it to late to raise some daughters from her?
Late in the season? Late in her life? I don't raise queens in Sacramento, so I don't know the queen rearing season. If she's alive you can use her for a breeder queen. Jay Smith had them as old as 7 years old...http://www.bushfarms.com/beesqueenrearing.htm#queenlongevity
> 3. Should I replace her this year?
> 4. And if I want to see how long she will live should I put her in a nuc and just add her young to other hives, or leave her alone let the bees do there thing and just watch for superseder cells?
If you want to breed queens from her, a nuc is good as she won't run out of sperm so quickly and you can keep grafting for a while. If you just want to keep her around, the nuc will probably do better. Probably not in my climate as she's less likely to make it through the winter.