I though Chinatsu would actually fall for Sakurako at some point, even if just a little.
But all she did was recognize the hardships Himawari goes through.
The only pair I've seen hints of for Sakurako other than Himawari is Akari: Sakurako respects her more than anyone else in Yuruyuri does, she always notices her, etc. There hasn't been much interaction between her and Chinatsu in the past.