I'm trying to recreate this issue right now, but I'm having no luck. Umiko can be chatted with on the laptop on Days 4, 7, 8, 9 if you have the Endurance Edition, 10, and 12. I'm guessing it's either Day 4 or Day 7 that this issue happened?
If it's any other day, just not clicking on her and moving to the next laptop day will fix the issue.
If it's one of those days... I'm wondering if you've clicked the little mail icon at the top left of the laptop? Your photo album -- have you opened it before?