Hey aprilynn,

Your kitty is lonely without her new found playkitties.
I would suggest definately thinking about adopting another, if you are able. I find cats are more happier if they have another playmate.
When I first got my boy,Thor, he was a small kitten and the people that lived above me ,at the time, said he would meow while I was at work. So, I decided that it would be good for him if I got another kitten to give him some company. This worked great....since then, I did loose my girl(who was Thor's playmate/sister), but adopted another little girl soon after. My husband and I knew that it would be best for Thor if we got another sister b/c we knew he would start to miss Nova.
I hope this helps. If you are unable to get another kitty, she may not get over the attachment/bond dhe had with the others.