Cute little old people fall a lot and require care for the injuries that occur. I have no idea what Abbie was doing there however; nurses that care for old people can be and are useful in such settings.
The grudge is absolutely ridiculous and insulting to all medical professionals. It's a really bad story line and pisses me off more than all of the other moronic happenings this show spews.
LPNs working in skilled nursing facilities often practice the same skills as RNs do. I have been the RN Supervisor at such a facility and many LPNs are as good or better at nursing skills than many RNs.