I Chat with Sara on Mac cosmetics online, and she thinks that is strada blush..
"Sara: I believe she is wearing Strada Blush. If you are unable to locate this shade, try Tenderling Blush, it's very similar."
I don't have strada but I do have Tenderling.. and I didn't find it similar with the blush model is wearing in the pic. Hopefully with will be a face chart for this! LOL