Why haven't I had dreams about my dead grandmother yet? [Spirituality & Religion]

My grandma died on Sunday. I thought it was Monday but the coroner determined differently. I found out on Tuesday and I'm devastated, but I still haven't had a single dream about her. Why hasn't she visited yet? A couple years ago a good friend of mine passed away, and I had multiple dreams about him, so why aren't I having any now? Could she be stuck somewhere or is it something wrong with me?