K.,
I'd say if you can, this would be a GREAT opportunity to get her a pet.
However,
When my girls were about this age we invested in a nice baby doll. My older daughter got twins! LOL...
Give the following link a try.
http://www.leemiddleton.com/
These are VERY nice dolls. They feel so real we sometimes just pick up my daughter's to hug and/or rock "just because"... In fact, the year Aimee got Mariah we took her to the grocery store with us wrapped in her blankie and with her bottle and passie. People didn't believe that it was a doll, she looked so real. They actually had to touch her to believe us that she wasn't real.
Funny story: Aimee handed her to me because she'd gotten tired of carrying her. She wanted me to put her in the seat of the cart. Well, she handed her to me by her arm, and I caught her by the leg. In just a few seconds a lady came to me VERY upset "How dare we handle a BABY so roughly!"... We still laugh about it.
They are pricy, but Mariah, Jacob, and Holly have been with us for years and years. They will be passed down again and again. They are considered collectible dolls, but I bought them to be loved, and we do. We SO do not worry about their collectibility. They are snuggly.
The year Aimee got Mariah she got the baby doll, several outfits, blankets... extra passies...etc. Like a layette. That was her Christmas. All of it. It's easy to string it out over the living room floor and make it LOOK like its a LOT of stuff. In reality, the babydoll cost so much I had very little money left. Most of her clothes and other items (Diaper Bag) came from our local Thrift Store. I did buy her a really nice blankie, a package of premie diapers, and two new outfits.
Happy Hugging!
T.