Hi, that's the end of her story for now, later on (in some update) you will have your promised date, hehehe. Maybe we should make it clearer when each girl's quest ends in subsequent updates.
P.S.: Could you also tell us which cell phone do you use?
Okay, we thought it was just an Android problem. And just like with SwadianButter, in our devices we could advance without problems, we are still not sure why this issue, but in the meantime, we also attach your advanced save, so you can continue your adventure.