I am so very sorry for your loss.
What a tragedy.
Hold on to your good memories...cherish them...they will carry you through. And know that your mom is in a much better place. She's not struggling anymore... I'm sure she knows how much you love her...and miss her...She's still with you...I'm sure of this.
There's no quick way thru the grief.
Be patient and kind with yourself right now.
With deepest, heartfelt sympathy...