Triple antibiotic is just the generic name for products such as neosporin, and many of us find that it works well for treating surface infections. I also use it as a preventative for my ducks and myself. Avoid the ointments and creams that contain topical pain killers, which, I am told here on...
I would be putting triple antibiotic ointment on after baths and at night.
The white thing may be some ripped callous. Wonder what others think about that.
Keep up the TLC and updates. Bless you both.
She may not want to drink right away, but sometimes hurt ducks will drink and not eat. I would go with CelticOaksFarms suggestions.
Please keep us posted. Try a lukewarm bath, too, it may give you a chance to look her over in addition to feeling her wings, legs, belly, neck and back.