MGM: Eliza could become Lady Eliza Carthy (strictly, Lady Carthy) if she married a knight, or married someone who became a knight ... but then, of course, she would perhaps have to take his surname to be able to use the title. (I wonder if the Honours committee have thought about the titles given to the married partners of same sex couples when one partner gets a knighthood...). I digress...
Anyway, first, Eliza, catch your knight!!! :-)
Derek