prevention is better than the cure. think what a&e if it was you. you would get it washed out a tet jab and some antibiotic tabs. your choice they are your animals. ask yourself how long it was in there and what has it walked through. i would give her a jab for her sake.
Can't remember the last time I went to a&e for an injury - though I probably should've done for at least two according to a nurse I know.
I don't think it was in there for very long - 1 hour at the most - though it probably seemed long enough to her, and the weather here's been dry for a month so there's no mud. I was thinking that as it didn't bleed the nail hadn't penetrated deep enough to cause trouble.
Point taken though - prevention IS better than cure; and I didn't write this post only to ignore the wisdom of majority so...
...Personally I would give an antibiotic shot just in case. I keep it in the fridge ready
That prompts a cheapskates question: Where do I buy them from? the vet??