Amazing milestone mutatio, something to be proud of.
I think your thinking about this gift too much. What is it you want to do regardless of what she wants, thinks, or reacts?
If you said you would do it and want to keep to your word, make it give it to her and be done. No expectations about what she will do or say. If she asks you just answer honestly "I said I would make it when the equipment was working, so I did".
If you don't want to, then don't.
I'm sure by your questions you might be looking for a specific reactio. I also see you questioning your own motives, nothing wrong with that. I question my own motives all the time and rethink things. Generally if the motive is mostly to get a reaction out of them it's not likely to work out the way you want.
Accept what is, let go of what was, and have faith in what will be
