I may as well consider this as a feature.
summoningitem = function(inst, doer, target, actions, right) if not target.inlimbo and target.replica.follower ~= nil and target.replica.follower:GetLeader() == doer and doer:HasTag("ghostfriend_summoned") then table.insert(actions, ACTIONS.CASTUNSUMMON) end end,
target is not restricted to Wendy's own Abigail. So you can use the flower to:
unsummon your Abigail on other Abigails. This is reasonable.(edit: this is not possible, I thought it made sense though)
2. unsummon your Abigail on your followers, like pigs, gnarwails. This is weird.
Play as Wendy, drag Abigail's flower over entities that is your follower.