I would be happy to try and establish a friendship between the two of these! Blue doesn't have a very long checklist as to what makes a friend or new company to her. She's fine with the more reserved types as well - she doesn't try to push them, but to open up more the possibilities for them to choose to continue interacting with her. They could have met once, not really have had much interaction, and Eu would still get a wave and hello the next time Blue saw her.

Blue would be find with her speaking through writing, also.