With an apology to my Mom (for the delay in sending her gift), and a "thank you" to Vicente G for correctly identifying the de-threading technique (deshilado, in Mexico), here is the present Rosa made for my Mom. It's a very elegant piece, and I know she'll enjoy owning it.
I'm learning as I go along here. Rosa has also informed me that deshilado has many variations. It can be simply the removing of the threads and it can also refer to the tying of the threads to form, say, the earring patterns. The roses in the earlier post are an example of "guarda" and there is something also called "feligrama" and when I learn the difference, I'll let you know. It's actually a lot of fun to be exploring this. Can't wait for my next trip to Todos Santos where I saw examples of this in the markets but didn't know anything about what I was seeing. Now, I'm learning.