Is it permissible to look at the Mushaf while reciting to the Shaykhah, without her knowledge, when one forgets a verse?

There is no harm in a person looking at the Mus'haf if they forget a verse, unless it is during a competition or an examination where they are tasked with reading and reciting from memory. In such a case, it is not permissible for them to cheat. As for a student seeking help from their teacher to correct them, there is no harm in looking at the Mus'haf at times.