Keeping your old piano depends on how well you like it, and whether or not you have room for it, without it being in the way, or just taking up space that could be used for something else. As Dr. ShiroKuro said, you really only need one piano. But there are other members here on PW who own more than one piano.
As for me, (and I'm an oddball or sort, for better or worse
) I currently have 8 acoustic pianos and a digital piano. My best pianos are in my house, two grand pianos in my music room (a Yamaha C7 and a Baldwin R), and an upright (Kawai K48A) in my living room. And, yes, I do play all three on a regular basis, but I do have a favorite. There is a convenience/benefit to having more than one piano in your house, even though you may have a favorite, if you have the room. My C7 is my favorite, but I also like the Baldwin R, and play it often as well. I also play the Kawai upright almost daily, depending on my mood and what room I happen to be in at the time. I like the looks of all three, even if I never played any of them.
My other pianos are in my small piano shop built on to my detached garage, and the walls and ceilings are insulated, with a humidifier that runs 24/7/365. The piano shop is 10 feet X 20 feet with a tall, sloping ceiling, 10 feet at the high end and 8 feet at the low end. I have an older Howard/Kawai 550 grand, a 100 year old Wellington upright (Bessie), a Howard Miller spinet, and a Cable console. The spinet and the console are family heirlooms, but still playable, and in tune; not sure what the future holds for them just yet. I also keep my digital piano in my piano shop, as well as my Yamaha PA system, and I play the digital fairly often.
My piano shop is getting a bit cluttered, and I gave the Howard grand to my granddaughter when she was 12 years old and taking piano lessons. The piano lessons didn't last long, and she's now 17 years old, and my son has yet to come and get the Howard grand, but says they still want it when he can find room in his house.
I have another 100 year old Conover upright in my detached garage (not in my piano shop) that has been exposed to too much humidity and is no longer a viable musical instrument. So, it has come to end of its journey, which eventually happens to all pianos, to some extent. But I enjoyed it for a while, and made a few music videos of me playing the old Conover upright before it was too far gone.
That is probably way more info than you were interested in hearing. But the point I wanted to make is that there is absolutely nothing wrong with having more than one piano in your home, if you have the room. And, the piano in your video does look nice, and is a nice piece of furniture, as well as a decent sounding piano. And, your daughter is lovely, and plays well to be so young!
Good luck, whatever you decide!