Hey, In order to go on a date with her, you have to:
- have 12 hears,
- be back from the island
- not have already asked her out(check under the "date" section in her profile, maybe it already says the location)
If the issue still persists, you can wait for the update with a fix that comes out in 12-15 hours.
Also, thank you very much for the kind words, and for playing the game ^^