If she doesn't "need" or show a desire for one, you don't need to get her one. It's supposed to be a natural process where they either become attached to something or not. My oldest son: he was born independent, I swear. Which was weird because he was a preemie, a little guy, and I wanted to protect him and love on him. He didn't like to cuddle. He'd allow me to hold him, but he wanted his back against me so he could "see the world". He'd lay on my husband's chest because my husband is very warm (almost uncomfortably warm) to the touch. He was given a lovey but he was ambivalent towards it. Around 2, he decided he liked one of his blankets (a lovely blanket) and he'd carry it around the house with him. I did not bring it along if we were going to the store or someplace for a brief trip and he wasn't going to be laying down (had receiving blankets in the diaper bag just in case, but rarely needed them). It was pretty much an at home thing (or if we were staying overnight somewhere). I was proud of his independence though I wished he "needed" me more and let me hold him. When my youngest was born, well sheesh, I got my wish, more than I expected. He's the big tough guy, looks like a rugby player, but constantly wants to be held and cuddled. A lot more needy. Kind of strange that the wimpy looking one is "tough" and the tough looking one is "needy". For now as young children at least. My youngest has a lovey (the same one his older brother had, only a different color), and his blanket too. He goes all around the house with them. If we go to church or anywhere for an hour or more, he wants at least his blanket with him (more attached to that than the lovey).
I did notice that when we took out a "normal" blanket and put in his "special" blanket, he stopped crying in the middle of the night so much (unless he ends up with no blankets on him, in which case I just sneak in, cover him, give him a pacifier which we only use at bedtime by now, and sneak out...he stops then). But as an infant, well....babies still just need mom or dad for a little while. Night is long compared to their lifetime.
All you should do is let them be themselves. If she grows attached to a stuffed animal or whatever, cool. If not, that's fine in my opinion. My oldest wasn't attached to any one thing, but would "take turns" with different dolls. He likes them all, and he just goes through a little phase for a week and then changes up.