Now, many many years later, she has passed it along to me.
So, of course, I've been trolling eBay to buy things for it, and checking out forums about it. So here I am.
Amazing thing is, while I don't have any of the original boxes (I do recall seeing them in my parents basement 10-15 years ago, but I know my dad had a "full cleaning" a few years ago, and got rid of them,) all the original manuals, overlays, and even the original receipt is still there!
Purchased from local "homewares" chain on 8-22-1982 for $199.99, along with Night Stalker and Space Armada ($29.97 and $26.97, respectively.). Then exchanged four days later under warranty. (Oops!)
Have Intellivoice, and 58 games (including all released Intellivoice games.)
When the system was still with my sister, I remained interested in the Intellivision, and bought the "Intellivision Lives!" and "Intellivision Rocks!" PC/Mac compilations when they each came out, and later Intellivision Lives for GameCube, and finally an Intellivision Flashback. (Which I just sent off to Byte Knight to upgrade to his "Ultimate" version - this will go to my sister in exchange for the real Intellivision, loaded with all the games we have physical copies of. Although I'm tempted to get another one upgraded for myself for ease-of-play.)
Back in the day, my sister and I would have frequent "Utopia" wars - always playing the same islands, to the point that we each have "maps" that are still with the manual for our "usual layouts." My sister usually beat me at Baseball, I usually beat her at Football. My mom was the best one in the house at Night Stalker.
When preparing to send off my Flashback for its upgrade, I made a spreadsheet, and between physical cartridges, the Flashback, and Intellivision Lives/Rocks, I own legal copies of all but 16 non-keyboard games.