I am a massive fan of Hidden object games, and would recommend them to anyone. Most have a storyline involving 'this is the issue, you need to get 'A' and 'B' to restore peace to this land...' type of thing, the introductions and following commentary are rarely un-subtitled (I often play late at night if I can't sleep with the sound off so not to wake my OH) so you always know whats going on.
Then you have to solve puzzles and find objects within various scenes - the difficulty rating is listed on the box, for an adult I would go for a 12+ as the puzzles are a bit more difficult. You can get them really cheap on ebay, or in Morrisons for £3-£7. My recommendations are:Asylum Conspiracy, 20,000 leagues under the sea, Ravenhurst, Haunted Halls etc. If she tries one I'll bet she gets hooked as the graphics are great in most :-)