Oh mama, bless your heart! I know how you feel, I was there when my ds was 2...he had to have 4 caps on his front teeth and 2 on molars. The weirdest thing is, my ds had an all organic healthy diet,no sugars or anything and he had all this enamel erosion....I kept beating myself up over it.
Anyway. He went under GA instead of office sedation. Not sure exactly what office sedation is, but I am thinking it may be conscious sedation, where they are awake but not aware of what is going on, they do not remember anything after it is over. My older son had this type of sedation when he broke his wrist and had it reset.
I was not offered this option, only GA. I was terrifed of GA but actually my son did very well. We did do the stainless steel caps, he is almost 7 now and about to lose baby teeth. The caps never bother him, I had one worry once when he was 4 and fell at school and I was afraid the cap was going to come off but it didnt. His friends think he has a "grill" and think he is cool, so he was never picked on either about his teeth.
With GA he woke up a little irritated but an hour later when we were leaving the hospital, he cried because he didnt want to leave. When we got home he ate 3 slices of pizza!!!!!! So it didn not affect him in any way.
Your dd will be fine, I know how you feel but this procedure is done all the time with great success rate.