This is my exact situation with my sister-in-law. She is very open and receptive to the Catholic faith, but I know that the fastest and most thorough way to douse all interest would be to have her attend her local New Mass parish. She's too smart not to see through the obvious discrepancy between the traditional Catholic faith and what's being foisted upon people these days. She's also has too much taste to put up with the hideous aesthetic quality of the New Mass church, especially the kind of music described in this article. As much as it breaks my heart, I find that playing wait-and-see is the only alternative until some future time when she has an opportunity to observe true Catholicism in action.
On the other hand, nostalgia bump for "Take Our Bread" which is featured prominently in the article. I remember learning this in grade school, and I could probably still sing it. As I recall, the refrain wasn't so bad, but the verses were particularly tuneless.
When I got tired of the silly deedledeedle music at the main morning mass at our parish, I switched to the early mass, which had no music, beyond a closing hymn that Father chose (since he's very orthodox, the hymns are always traditional.) Perhaps you can find a dialogue mass nearby that will provide your sister in law with a mass more given to prayer and reflection than performance and entertainment value.