Fordola turns up on her own in the Endwalker role quest capstone, no mention of Arenvald. So I do think they'd be willing to put her in storylines alone when they think she'd fit there. Their role in the SMN lv80 quest was interesting, though; I understand why they can't, but I'd be interested in seeing a version of that quest written for players who are after the point where Arenvald is injured.