Thought I'd add an update to this.
Now that my daughter has returned to Nepal the lcd screen has "fixed itself". So here's my theory:
Climate was certainly within the specified temperature and humidity range but she was living at around 4000m (13000ft) and travelling up to nearly 6000m (19000ft). I'm wondering if the low air pressure at those altitudes was causing something in the lcd construction to expand (air bubble) and put pressure on part of the screen???
Anyho it looks like I don't need to replace the screen when I eventually see the camera again!