How can I cope with my nana's passing.?

My nana passed away sometime last night at the age of 73. Just 10 days ago she was still texting us every night, sounded like her normal self on phone calls. Let me tell you and I can't even explain in words, she is the nicest, most caring, loving, selfless, person I have ever seen and I will ever see in my entire life. I'm 16 years old and she has been by my side treating me like gold for every single bit of those 16 years. She is the nicest nana you could ever imagine. She did not want to be a burden on us ever and has not been a burden at all to ANYONE in my family. No chemo was done and we now think she did not want to do it since she couldn't on her own and did not want to be a burden. My mom and I have been over there helping her a lot taking care of her, spending the night. She says "honey you don't have to help nana, you don't have to do this" because she is so considerate and doesn't want to cause any discomfort. Again I can't even explain in words how much she has impacted my whole life. Again I'm 16, my little sister is 12 and my brother is 7. Recently I have been spending a lot more time with her and it was not because I knew this was going to happen. It was so sudden, but luckily my mom and I were still there for her final night. Even though this was the first time in a week we didn't stay overnight. I have cried my eyes out today and I'm falling apart because everything reminds me of her. Is there anything at all I can do to help the pain. She loved us so much.