If you have some spare time, create a unique gift box which can confuse her about your gift. Be creative and work hard for it since it is normal for her to have high expectations from you. To make it even more interesting and a lot less work, create QR Codes using a QR code generator that scan into different URL images creative gift homemade clues.
I loved her to pieces. She reminds me of the pictures of your mom, always smiling. What a great tribute you have here to your mom. I can tell she was something very special.