This is not bidah, if she does it for no specific reason.
If she did it because she firmly believed that it must be done every time she reads the Quran, this could be an innovation. But if she does it because she wants to be in the best of shape when reciting the Quran, this might be permissible.

If a girl wears a head scarf while reading Quran, and she knows that this is not mandatory, but still wears it, is it biddah?

Reading/Reciting the Quran |