It’s very doubtful then than Belle would show up in Storybrooke. If she did, she would be a very old lady, Granny perhaps? But then again, we don’t know how long the Ogre wars lasted at this point.
I thought at first that Belle’s storyline must be way in the past also because of the Ogre Wars, but after seeing the preview we see Belle speaking to the Evil Queen and she seems to already be the Queen at the time though we don’t know if it is after she killed Snow’s father or before, but regardless that means that it has to be i would say in the last five years before curse.