I would suggest picking out tracks rather than going for a whole album, based on what you think she will relate to the most. Would it be humour, musicianship, a nice tune etc?
The first Zappa track I heard was 'The Dangerous Kitchen', and then various tracks on YCDTOSA Vol 3. I was totally blown away by Thunes.
This was in 1989 - the year after the last tour - BAH!