Happy Birthday~ I have seen many things listed above that I would suggest so no need to repeat.
What I will say is I would buy things that have a life, not one time use stuff for a good portion of the gift money and then a few frivolous things.
You know you will always need adhesive (an ATG is the way to go), glue dots and cardstock is another staple, If you have a cricut, than maybe some extra blades and mats. If you make cards maybe a scor pal would be handy for you. Like to emboss....maybe a heat gun and powders. Acrylic and rubber stamps are good too.
And look for things you want that you cannot get locally.
Hope these suggestions help.