Can one hen live alone (at least for a while)?

[Lisa Helps]

We lost one of a pair of hens several months ago (I think it was before Christmas) leaving us with just one. Our lone hen has actually done surprisingly well since then. I am getting ready to put the new flock of chicks outside this week and will probably introduce her to them fairly soon.

We are in the same situation? How did it go when you introduced the one chicken to the new chicks? How old were the chicks?