Although she knew that Jiang Hao asked her out of curiosity, it was really embarassing to hear it because her restriction were a special type of arrays which were inscribed on her robes.
To remove her restriction, all she had to do is remove her robes, which is impossible to do in front of him.
Another thing is that she doesn't want to tell him about it now as it would become even more embarassing for her, she might seem to tease him sometimes but she won't be able to handle this one herself.
So, she can only lie about it right know.
"Sorry Junior brother, master has forbidden me to remove my restriction without her instructions, so I won't be able to do it even if I know how to do it"
Jiang Hao nodded after he heard that, but why was her face red? He didn't know and didn't tried to ask about it.
Well it won't change anything, they still can spar easily and since senior sister at Mid stage , even without full strength she will be strong.