@Strongstache Well, from what I understand she has feelings for Yamada, and it's implied in this chapter too, she always clears up the misunderstanding that Yamada likes her, but she doesn't deny or imply not liking her.
And the Kokomama thing is more the allure of her being a cute caring mom that strikes right in the zone sometimes.
But in the style of this series, someone is crushing on anyone at any given time anyway.