i once worked directly with a hospital administrator who audited my work (lucky me!) --- it was one of those random things for quality control.
since day one of nursing school, i've always been told to always be precise with my documentation no matter how busy i get in order to protect my license. so when i was audited, the administrator was surprised that someone so young was doing way better than the "experienced" nurses; mind you, i've always debated with myself if i was doing way too much since my senior nurses would tell me that i was too "precise."
after being audited --- i was scared out of my mind --- and the administrator being happy with my work, i felt more confident that i was doing the right thing to represent my company if jcaho (the joint commission) happened to stumble across my work.
the administrator then had me make a booklet to help refresh my colleagues on how to document properly. i was also given expressed directions that if anyone tried to give me lip to contact the administrator's direct line so s/he can come down and teach the unit personally. *ouch
i don't think you're making yourself work hard. you're doing the right thing. as for the other nurse, i think she just needs a friendly re-education; just let her know that in order to protect her license she ought to use her own findings (if there is definitely a change in the patient's status). also, it would help a lot to see if there were improvements to the patient's condition (eg: in regards to the petechiae improving).