No, this is actually Yuhan for the first time showing a deep sensitivity and understanding of Qiaowen's personality. The problem with amusement parks is Qiaowen being reminded of her family breakup so Yuhan brought in a substitute family for her.
Of course, the problem is that she doesn't really know about Xiaohe's equally deep crush, but seeing that Youzhen is there, that's probably also because she's getting the wrong idea about their relationship thanks to Qiaowen shipping them.
Basically, Yuhan is being a great and caring girlfriend to Qiaowen here by indulging her special needs and her viewpoint (shipping her "lil bro") but in the process as always chopping up Xiaohe into mincemeat.
Anyway, since we all support Qiaowen's ship as well, this is sort of the optimal outcome.