Fairly certain that Aunt Sal's tarot card reading was significant. Pretty sure the point that they emphasised that she taught herself means that her cards are wrong, but not 100% incorrect, I reckon that Roxy's cards were actually meant for Ronnie, and so Ronnie will be the one to die. She's also being a fool because her decisions are being lead by Jack.
Also I think the drowning story will be true, Roxy will be the one drowning, but Ronnie saves her in time, but then ends up dying herself, it will be reminiscent of New Years day years ago, when Sean kidnapped Amy and Roxy and tried drowning Roxy, till Jack and Ronnie came to save them, the difference this time being Jack won't try to save Roxy, so Ronnie tries alone, only to die.
Ronnie will die, and Roxy will leave with Amy to go off with Glenda and Danny.