Looks like it's either going to be the wiper relay (located in the passenger fuse panel, 3rd from the left at the very top) or the wiper motor itself (which is where the 'park' function is held (most likely based on resistance, so maybe you can pull the motor and clean the contacts).
A properly running Focus should heat up rather quickly, vs older 4cyl cars. But this also depends on what you're calling 'the normal range'.
But so long as the cooling fans are operating correctly you/she should have little issue with the car overheating.
13 years, 124,000 members and still no sponsored racing.