Actually no. There's just evidence Kagha had been contacted by Shadow Druids from Cloakwood suggesting she could change her alliance to their circle and was almost ready to give in (she can actually do so if you fail to convince her it's a mistake). The person mentioned in the note, Faldorn, was a playable NPC in BG1 (an evil Shadow Druid from the Cloakwood) and an antagonist in BG2. Note that the shadow druids are actually present near Kagha the whole time as they are shapeshifted as 3 mices and only reveal themselves when you present Kagha with evidence of her dealings with them.