I would go to my boss and say, "(Other employee) was upset because she felt I acted (whatever). I hoped I did not come across this way to you or anyone else, because I try to be a good employee. Do you have any suggestions on how I can improve" Put the boss on YOUR side by letting your boss know you're willing to put out the extra effort to better yourself, no matter who was right or wrong, if this is possible in your work environment.