Angela, I am sorry to hear of your loss.
First thing you want to consider is measures to stop your
remaining tiel from laying. You should rearrange the cage so that
she doesn't have the "nest" available where the other tiel layed.
Also, be sure she is on a good diet which supplies the adequate
amount of calcium. You may also want to move the toys around in
her cage or buy her new toys to keep her occupied during the day
when you are gone. If her laying cannot be stopped and is
excessive you may want to check with an avian vet in your area and
ask about lupron shots. This is a hormone which is very helpful in
stopping laying, but try other methods first.
Also, this may be a good time to try and tame your bird. Have you
ever worked with her? If you don't feel like you can train her and
decide to get another bird, I would recommend another tiel, but
let each one have their own cage. They can talk during the day and
provide company for each other. You may want to get a playpen that
they can share and interact on when you are home to supervise.
My last bit of advice would be to look around at sanctuaries or
shelters in your area and try to adopt a needy cockatiel. There
are many available that need good homes. Good luck to you.