I'm still not sure if becoming an idol was her always her dream or if she is doing that for Tatara. In the first case, well, while I think the relationship ban is stupid, this is a path she chose herself and she must accept the consequences, including the fact that the boy she likes might be always available at her own convenience. In the second case, she should realize that Tatara already likes her and she only has to confess. Regardless, it's true that she has to act soon or it will be too late, let's see if the author will keep giving her focus.