If Nijisanji doesn't issue a formal apology for their treatment of her, they're doomed. It's that simple. They now have a woman claiming she tried to kill herself due to the stress they inflicted on her, not once but TWICE.
This is company-destroying. Anyone who willingly stays aboard this sinking ship and toes the party line is doomed. There's no coming back from this.
Again, even if Dokibird is somehow lying about all this the best PR move would still be an abject, grovelling apology and total retraction of all claims/threats/etc.