Hi,
I would actually say the DM made a pretty reasonable suggestion. You will learn a lot about gas management and diving physics during the deep and nitrox courses. I would consider this combination a much deeper education than PADI AOWD. I also do not share the view that CMAS** would be automatically the better route (though for sure in itself broader in scope than the 2 specials): this may entirely depend on what you are interested in and with which agency you plan to continue your education. There are interesting things to see at greater depth. At some sites e.g. corals will be found only beyond 30m. Lastly, do not let yourself be scared out of a deep special by thinking that narcosis will always be scary and very dangerous. It is something to consider, but something that can even be an interesting part of the world. Your instructor will be there to cover your back on your first steps.
Please consider that in contrast to us here, the DM has seen you dive and also will know what is to see at which depth at the sites she is working. In your case, I would probably put more trust in her words than in those in an online forum by us, who do neither know you nor the sites you are diving (although for sure additional ideas are always good).
Have fun!
Dominik