I have had a glass top dining room table for about 35 years and it is still going strong. There are a couple of scratches but, otherwise, it is fine. About six years ago, I had new floors put in and the guys doing the installation chipped a corner off. Needless to say, I was pretty upset. They took it to a glass shop where they cut off about 2 inches the length of the table and ground the edges. You would never know anything happened to it.
I'm moving in a couple of months and this table is too large to go with me. As it happens, I have a round glass coffee table with a 42" diameter. The glass is 1/2" thick and I've decided it would be perfect in my new place so I started looking for table bases. This place also sells glass tops so you could get an idea of the cost from them even if you go locally. I do think if your plan is to put glass over wood on your daughter's table that I would opt for the plexi for that.
Here is the on line source I found for table bases and table tops.
http://www.kitchensource.com/table-bases/tc-kf2013.htm