i started camping her and her friend at lvl 23, currently 24, and have made 100pp so far. here's what you do:
first, break up the camp. have siphon life, shock of poison, heat blood, englufing, heart flutter, scent of shadow, screaming terror and feign death memmed. now get your pet and tell him to guard right next to the tree that's nearest both their hut and the water, and tell him NOT to taunt. now sidle up to the hut and select Ascalia , then run back to your pet. run half way down the slope behind him, next to the water, and cast screaming terror. ascalia will begin running up the hill, and larisa will come after you. run along the water away from the docks, and cast engulfing darkness and heatblood on her. what you need to do is get a very good distance from the hut and yourself so when screaming terror wears off, she won't see you and come after you. then basically nuke larisa with Shock and your Tap spell until she's dead.
after breaking camp, always open the fight with scent of shadow so your nukes do maximum damage. usually i'd end the fight standing at the boat on the corner of the island, and one last shock would drop her.
they're fast spawns and if you wait even a minute too long between medding and fighting, you'll have to break camp again. so-so exp but great loot. goddamn wood elves can face the wrath of Bertoxxulous !!