Responses

The restriction prevents her from saying or doing ANYTHING at all that she is the former duchess. Its a tricky restriction and if she wants to be the one to really SAY it either Ern needs to ask her a question that she can answer and affirm her status or she finds a loop hole for her wording willingly
can't she just nod to tell him she's gabriella or kiss him, write, sign language omagyd there are too many ways to tell him