I think they should tell Tapasya and Iccha about the accident. As its the sudden change in there behaviour (after the accident incident) that confused her. This will also release Iccha of her obligations and she would be able to take a stand.
I dont wish that she takes revenge. But she should not stand in front of the trio (Nani, pushkar Tapasya) like an accused.
If anyone has other non-violent ideas of reforming Tapasya please post ur views