She was lying this whole time ? Take a step back and think about the overall situation. She is almost certainly trying to process what you have told her, and may not know how she feels about it from day to day. Do you feel the same about your dressing all the time?
It is possible that she has been telling the truth the whole time, and the truth changes. It is also possible to hold contradictory beliefs at the same time (for example a logical view and an emotional view)
In terms of her disability, I suggest that it has no relevance at all to the current situation. This is not something you can trade points on.
Try to look at this from her perspective, and give it time. Just because she knows it exists doesn't mean she wants to hear about it all the time. To avoid further deception, let her know the scale of your dressing if she doesn't already know, let her know that if she has questions she can always ask and then leave it at that for a while (a few weeks at least).
