Most surgery is a bit traumatic, but I wouldn't be too overwhelmed with the thought of it being an amputation. I'm guessing she would be happier with a few days of pain rather than a life time of irritation from it.
All dogs tolerate pain differently and it will vary based on what procedure the vet does (laser or not, etc.). If it has to be done it will be okay.
ETA: She probably won't want to walk on that foot but the good news is that they don't walk on their dew claws anyway.