To refresh people's memory, Bobb was the person who signed the affidavit that stated a diligent search had been done, and there were no further government documents that had not been handed over. This was before the August 4th FBI search when about 15,000 government documents, including over 100 with classification markings, were seized.
Now she is claiming that she just had some kind of administrative and publicity role. I find this claim absolutely bizarre (i) because I cannot see any way it helps her against potential indictments for perjury and obstruction of justice; and (ii) that presumably means there is no attorney client privilege protection preventing disclosure to investigators of her communications with Trump.
I just have one possible theory, if she is smarter than she appears (or more likely has engaged a lawyer who is smart). Maybe, she wants to turn on Trump to save her own skin. She would potentially be a very valuable prosecution witness, able to negotiate a sweet deal. I assume Bobb would be legally barred from such a move if she was Trump's lawyer.