Unfortunately, for really smooth tones, my fall back is my bulk supply of Plus-X, which isn't going to do you any good. I haven't played with the current crop of medium speed (ie iso100) films. Anyone have any feedback on Retro 80S for this? I would think that would fit your wants, but I've never used it.
Going for something digital can't do, I'd suggest Delta 400 as well. It has a particular way of rendering shiny metal that I haven't found with any other film. It is very sharp, but still makes pleasing portraits. I've heard it looks digital to some people, but I don't find that.
The suggestion of Tmax400 is a good one for it's huge range. I mean, one dev time and take your pick of ISO200-800, that's pretty forgiving, especially when learning.
The other thing I'd recommend is focusing on a really nice paper. The paper is what your daughter is going to see and hold, so getting something special there should be just as important as the film. Personally, I'm a huge fan of Adox 312 (pearl VC RC). There is something about it I find magical. I'm using magical in the sense of "sufficiently advanced technology..." I can't tell you why I prefer Adox 312 to Ilford MGIV, but it just looks better to me.