When I said 'liked', I meant in the past in the context of the show. When they were kids, it was pretty obvious they all liked him. Since we were talking about 'speculation', there are ways to read into the subtleties of characters as well.
Jinta was the leader of their group, and they all admired him to some extent. Tsuruko was always guarded, but you could assume that when Naruko (because I refuse to call her Anal) asked if he liked Menma, she wanted to know too.
The way she acted in response to Naruko's friends in the 2nd episode just built on the subtlety. Maybe she isn't crazy for him now, but there is still that lingering fondness. And as an older person, she's better with how she guards her feelings.