The effects would change, yes — the beckoning person would be highly dependent on Ion's subconscious and who she might be thinking of most. But the more she visits, the more she'll find that these effects are harder to shake away. She might be more prone to seeing aparitions or hearing fully formed sentences and become entranced. The night terrors will worsen with each and every visit as well, becoming more grotesque with the risk of bleeding into daily life as well.