"don't talk anymore."she said to the students angrily.(改为间接引语）

She told the students not to talk anymore angrily.
直接引语如果是祈使句，间接引语应改为"tell(ask, order, beg等) sb (not) to do sth."句型。如：
"Don’t make any noise," she said to the children. →She told (ordered) the children not to make any noise. "Bring me a cup of tea, please," said she.→She asked him to bring her a cup of tea.

She said to the students that didn't talk anymore angrily.

She told the students not to talk anymore angrily.