M.A.
T.,
I think it's great to have your 2 year old involved with other children, but I do think that sometimes they can be overstimulated, which in turn can make mommy overstimulated. :) I have 2 children. My son never met a stranger from the time he took his first breath. My daughter was stuck to me like glue and was very shy. She did enjoy being around other children, but she also required alot of mommy time. I think that we so badly don't want our children to miss out on anything that we schedule way too much for them, and for us. I was a single mom for 16 years, running my own business, coaching every team my kids were on, pta everything, every charity board or committee. I ran myself ragged, and sometimes I ran my kids that way too. One thing that really helped me out was learning to say, "I'd love to, but I can't". I think you've made a wise decision in waiting to send your daughter to nursery school. They have plenty of school to go through over the years. My kids are almost 20, and 13. I wish I could have some of those years back, it goes by way too fast.
Maybe you could take Tuesdays off, then alternate, say one Thursday at your house then 2 weeks later on Thursday cousin's house, then 2 weeks later on Thursday at your house, and maybe 2 Fridays a month with best friend. That way you could still get in the time with your daughter, and also get in some quiet seclusion time for yourself (which you definitely need!)
It may not be able to work out for you that way, its just a suggestion. For what it's worth, I hope it helps.
-M.