Can someone sue if it has been over six months since the injury?

A female buddy of mine got really drunk and scratched up a female friend of hers and scared her pretty bad. The incident has blown over completely but my female friend is still worried that the friend that she scratched could still possibly sue even though the scratches have healed completely and it has be more than half a year since the incident. Can that woman that got scratched still sue? What if she somehow still had picture evidence of the wounds/scratches? Would she have a case against my friend? It is on my friend's mind since she keeps trying to be nice to the friend to stay on her good side, but the friend keeps nagging and butting into her life.