Her face is also peppered liberally in murals and street art in Los Angeles. It's unusual, because no other artist in Los Angeles seems to be particularly celebrated in that way — it's Kahlo's image that seems to be important more so than her art.
It would be interesting to chat with the people responsible for those pieces to get a sense of what they knew about Kahlo and what attributes about her they find interesting. I have a similar hunch that many of the people plastering her face around the city probably actually know fairly little about her.