Car ignition

my daugter’s 2009 chevy colbat all of a sudden will not turn off can’t turn the key off engine will not turn off

Look in the owners manual and see if it locates the fuel pump fuse and pull the fuse.

DO NOT DISCONNECT THE BATTERY WHILE THE ENGINE IS RUNNING! Doing this can cause a voltage spike in the vehicles electricals causing possible damage to the charging system and/or to computers and modules.