There was just another thread about spaying a tiny one, and it seems everyone is spaying right now, myself included.
My Candee is 2.11 ounces and I just spayed her 3 weeks ago I was also a nervous wreak, but she came out happy as ever and only had a 1/2 inch cut that healed in about a week, and got her stitches out at 14 days later. You can't even tell she had a surgery the scare has vanished and its only been three weeks since the surgery. But, I would say wait until all her adult teeth come in and you see how many baby teeth need to be pulled, otherwise your going to find yourself going through this stress all over again when she has to go under anestisia for dental work. I even paid extra for pain meds and she didn't even need them, the next day she was back to her normal self like nothing ever happened. My bf even joked and said are you sure the vet spayed her, maybe she just made a little cut on her and sewed her up

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Your baby will be fine, but I would wait until the adult teeth all come through.
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Candee, Bear, Daizy (in spirit, R.I.P) and Pepsi's mommy