Sorry, I meant for a long haul of the season however, it's only hopes as I'm sure by looking at the opening that while she'll be involved in the season (much like Gary in DP), she won't be in a lot of episodes...
Uh, most people already know she'll be leaving after the Junior tournament. The opening shows the BW trio isn't changing, Dawn's not rejoining the cast and there is no reason to think she'll linger in Unova either. I don't know why you're bringing up Gary either, when the guy only appeared in 3 DP episodes out of the entire span.
Most likely after Dawn leaves again it'll be her final appearance in the show, if past characters are any indication. I am sure Pearlshippers will enjoy the time she sticks around for.