Secretly build what you want for yourself. If it all goes south and she ends up not being interested. It wont break your heart as much. Much later in life if something ever happens to you she will want that car. Sometimes we think our kids are interested and they're not and sometimes we think our kids are not interested and they are. And it can switch over time.
I have both my first car and the car I remember my dad buying when I was knee high.
My daughters first car is a Z3 BMW, paid 2.5k with a bad motor. Fixed it and been in use for 4years. Why a Z3 you ask? NO BACK SEAT. But a co worker had to ruin it for me and point out the long *** hood. I just dust it for prints now and then. So far all is good.