The Silverpine Forest quests “Sowing Discord” and “7th Legion Battle Plans” appear to have been completely broken by the BFA stat squish such that they’re effectively no longer soloable, even with the three NPC followers.
Add to that “On Her Majesty’s Secret Service” and any quest involving elites toward the end of the zone’s questline. The elites hit so hard and take so long to kill that it’s impossible to kill them without some very creative kiting and health restoring tactics. And I’m pretty sure Lorna Crowley is just impossible to kill without a high level person helping you, or in a large group - of which there aren’t any in Silverpine. Ever. Or any other people, period.