Thanks to a litany of … interesting game mechanics in the first generation of Pokemon games, Derpy has put the game in a softlocked state and is now stuck in place. Her persistence is admirable, though, albeit misguided.
[For context](https://tcrf.net/Bugs:Pok%C3%A9mon_Red_and_Blue#Lorelei_Softlock) Briefly, the """good""" AI that Lorelei has tends to prioritize moves with type advantages against your team without regard for actual damage dealt. Combined with the fact that Rage locks you into using it until you get knocked out means that under certain circumstances, you can create an infinite loop where you can't knock out one of her enemy Pokemon since it keeps healing itself, but where it won't attack your Pokemon either because its healing move has a type advantage against your own Pokemon. That is, unless you miss a "100% accurate" (by that I mean you have a 1/256 chance in missing what a great game lol) move 20 times in a row, but… don't hold out hope for that.