I'm gonna go outside the box and say to get her a U-Bass.
I have a talented 12 year old and she has some interest and enjoys playing when she does, but it was like pulling teeth to get her to practice at home. I think it is common these days with so much stimulation available from their devices. She does have a busy schedule and always seemed to feel it was taking time away from her free time. Always a battle between whether we should push her to develop her obvious talents, or let her come to it at her own rate.
I bought the U-Bass about a year ago and it made our commute time the place for practicing and jamming. It worked great. I also got a battery powered Cube bass amp, but it really wasn't necessary since we changed to Galli flatwounds, which project much more than the stock rubber strings. Since installing those, we haven't really needed the amp.
We do stuff like study basslines in Anytune (iphone Transcription app), putting them up an octave or 2, slowing them down, playing with the EQ feature. She also enjoys learning isolated bass lines and prefers learning by ear. So driving time is like a private lesson, mostly focused on learning songs, learning a bit about the theory, and really dissecting the tracks to get all of the the nuances that give the lines their feel.
Right now she is really into "Don't Start Now" by Dua Lipa. She also enjoys playing "I want you back" with the isolated track on YouTube. She's also gotten into "I Cant Help It" and "Off the Wall" by MJ, "Senorita" by Shawn Mendez, "Good Times" by Chic.
She also has been inspired by many of the great young female bassists that post cover videos on Youtube, like Marta Altesa and JuliaPlaysGroove.
Since lockdown, we haven't been driving much and she has been playing bass indoors, which has been great as she is now playing the full size bass every day.
We do have a Ibanez Mikro and it is fantastic, super fun for both of us. There is an enormous thread here about them. They are just killer basses, and unbelievably cheap. Can't go wrong. We actually have two, I made one fretless and she messes with it every now and then.
Now she wants to be a big girl so she is playing a full size Stingray 5. But I wouldn't recommend putting a 12 year old on a full size bass until they really ask for it.
I wish you and your daughter the best!