I miss my Grany

It's been 3 years since passed and a lot of other #######5 things happened to me in those 3 years (not relevant to this) but still I really miss her and I'm wondering if it could be the reason I get random spells of being sad?

She was the closest person I knew and basically raised me (even though I have almost no memory of most of my childhood the few memories I do have are almost all good ones and she was with me)

Man life sucks :/