Talking to dead loved ones in dreams

Did you ever have such dream? I had this magnificent dream about my cousin who passed away at 23. She was the closest thing to a sister I never had. I'll describe dream first, then context behind it. In this dream we were sitting on a couch at our grandparent's apartment as we used to and we talked while both fully aware that I'm alive and she is dead. Basically, she came to talk to me in this dream so we can put aside things we resented. I told her how sorry I was for the way I acted and how much I wished I spent more time with her and she told me she doesn't resent me and knows how sorry I feel and that it bothered me for all these years. We hugged and resolved everything and upon waking up I felt so inspired and relieved about it! Since then I always go to her grave on the anniversary of her death, that I didn't do as much before. Now the context. We were very close as we were growing up but in teen years we driffted apart. She was year older than me and we used to go out often before. But then I started going to some places she didn't like, in crowds, loud music and I would call her with me instead of making time to go to some normal place. She was very religious person, very sensitive and gentle. I on the other hand threw my religious beliefs away and started to rebel against everything and went out to those questionable places. Anyway, as we became so different we rarely saw each other. That summer, she went to seaside and came back feeling sick. She was ill for about 10 days, no one knew what was wrong with her but she just lied at home, didn't get hospitalized. I think we briefly talked once over the phone in those days but I'm not certain it really happened. One day my mom calls me to tell me she died. I was in complete shock, how can she die, she's 23?! We went to their home, her parents also in shock obviously...they said she probably had a heart attack. Her mom said to me she called for me in those last few days, talked about me. And I was so pissed off they didn't call me to come to see her, I was pissed off they didn't take her to a hospital etc...I would certainly come if I knew her condition was such severe, we never had a fight or anything, we just driffted apart...even if we did fight, I'd still want to see her! But she was gone and all words between us were left unspoken. Until that very realistic dream. It brought a lot of relief and I actually believe I did talk to her spirit in some other dimension, I know it was her and I know she found a way to contact me cause that's how she was - sensitive and gentle - she wanted me to stop resenting myself for how I acted and to assure me she holds no grudges and that she too felt very sorry we didn't get to talk one more time.