That is a nice looking knife!
Unless there is some engraving or paperwork that states that it is #xx of xxx, then it is not a special production run. What makes the knife special is the previous owner! I may be wrong, but I don't think it has a high collector value.
As far as using it, that is up to you.
If you store it, I would take it out of the box, oil it, and wipe it down every year. Perhaps add a tiny desiccant pack to the box if you live in a humid area.
If you decide to carry it, it will be a constant source of good memories for you.
Whichever way, either one honors her, so do what feels right to you!
Welcome to AAPK!
Jesus is life.
Everything else is just a hobby.