Ditto to what JillNJo says .. the machine isn't the issue, so much as practice practice practice!
I tried it on my previous machines, but never really focused on it. I now have a Janome 6600 that I am doing it with ... is it any better? I doubt it, just that now I am "ready" to focus more towards doing it.
So I think your answer is more so of looking at what features your DD might need as to what machine might be best for her to choose.