For example, she can use him. If you quote him in an argumentative paper, it is him and her.
For example, what you want to say most is:
I heard that elephants are the largest mammals on earth.
This will not work. Say:
It is said that elephants are the largest mammals on earth.
In my opinion, all these need to change. There is no first person.
There is also the use of passive voice:
I did some research-> Some research has been done. Avoid using me.