I got my own DD one of these last year & at then 8 she is older, but she was nervous of using my machine as it was too fast for her & I couldn't get a hold of the old style hand operated ones I learnt on myself -
It is what it is, nothing fancy, quite slow which is great for beginners & won't handle anything with much weight or size, so she won't be using it to knock out her first catwalk collection, but its been a perfect first electric machine for her - fine with making dolls clothes, cushions, soft toys, decorating Ts etc - which is all she's interested in doing just yet.
The one thing I will add, is make sure you do have a lower table than standard, as the cable isn't that long - something that caught us on the hop as we no longer have the toddler tables etc - thankfully an old fold out kitchen one came to the rescue - but we were stumped in the beginning
Also Argos do a great sewing box, that has all the bits you will need in it, just add some cloth scraps & she'll be set up :)