I'm sure salt and Terramycin spray will sort out the ear tag. When I tag, I pour a little bottle of tea tree oil into a bottle of surgical spirit and pour this over the ear, where the tag has gone in. It seems to have avoided infections so far.
No experience of the lump by the toggle but if your vet isn't worried? Maybe take her back?
As for goat's feet, like sheep they vary so much. I only do my goat's feet two or three times a year and so far the Shetlands look to have good feet. The Rough Fells needed doing every month or so!