how do i know if my kitty wants another kitty? ive heard that some females that got spayed w/o having a litter, sometimes get depressed cus they want babies. shes 7 years, and recently been acting like a kitten, like she needs a playmate.

if i do get another kitty, how can i pick one that is calm yet playfull like her? i know the kittys at shelters act kinda scared, i dunno how to tell their personalities.