Aww, the short-haired girl felt a heart prick when she agreed to give support (chiku sound effect). It is always painful seeing this situation never turn out well for the supportive friend. Good for her for getting chosen.
It feels like the chapter might've gotten misinterpreted since "先輩" got...
Original text was "お母さん達は？" (okaa-san-tachi wa). Literally, she is asking where their mom and at least one other person is and has absolutely no implication that this other person is a second mother.
@Edgerunner
I may have missed some but all chapters relevant to Aozora seem to be
17, 22, 23 (pre-kiss)
34, 35, 37, 49, 54, 67, 68, 72.
Aozora is also mentioned in ch 69.