I think you are over thinking this. Of course, she is going to focus on the presents - she is 5. I would think none of us really understood the true meaning of anything until we were older and more mature. I would also remind you that most adults, if any, are not scarred b/c there is no Santa and we were told a 'lie'. It is just one those those coming of age realizations.
They grow up so fast, are you really ready to burst that bubble so young?
Mine are 10 & 13 and we all still act like Santa is coming. I love the look on my boys faces when they see what Santa brought them. To this day I still get Santa gifts at my parent's house. It's more of a tradition than a reality of whether Santa is real or not. I never let my parents know that I knew there wasn't a Santa b/c I didn't want to stop getting gifts from him. My oldest has taken on the same attitude. My youngest does question though, when he does ask I will tell him of course there is a Santa or that there was one. B/c Santa couldn't live forever and he wished he could continue to bring gifts on Christmas morning, he passed the tradition on to the parents, for us to be Santa in his absence. I will add, what a true gift it was and an honor to carry on the tradition.
As parents we lie about many things, I'm not quite sure why this topic is so touchy. What do we lie about...sex, alcohol, speeding to name just a few. Sex is great and very enjoyable but do we tell the kids that? No, we focus on the dangers and consequences instead of the enjoyment. Alcohol, those that drink love the little buzz they get, but do we tell our kids that? No, we tell them of the dangers and consequences instead of the enjoyment. Speeding, how many go 5-10 miles over the speed limit? We just make excuses for that lie. There are many lies we tell to protect or to bring surprise. If I have a choice to tell a lie to my kid, this is one I have no problem with telling.