In all likelihood, this problem needs to be addressed in both the operating system and in Word. The only way she knows to stop it is to close the document and open it again. All of the keys seem to be remapped to the foreign language and Erica don't understand why.
For example, without warning when she presses the question mark she'll get an 'e' with an accent, and the '~' (tilde) produces a '#'. Erica wonders why Word all of a sudden change the keys to 'foreign' lettering.