Toddler needs 4 teeth crowned Advice please

So my daughter at 2.5 years old has decay in her front 4 teeth, the dentist said it is because I nursed until she was 2 at night. I didn’t allow her any juice or sugar until after 18 months old and we brush twice a day. Anyways they have her scheduled for general anesthesia and crowns to be placed on all 4 front teeth. Has anyone done this? I am terrified I’ve never been under anesthesia and the idea of my baby going under scares me to death.