Not having seen it won't stop me from postulating.

I would say that the character of the growth on her at this early date would
be microscopic and rather translucent. Possible to photograph, but not
terribly vivid.

Do a fun study! Take a picture, the same type of record picture, every time
you visit. I would suggest the shallowest rails with the most solar
exposure. You'll have a cool collection showing growth some day.