+1 to wrists and knees - I see falls every week that these would help with/did help with. Helmet I'm 50/50 on - sometimes I wear one, sometimes I don't - but note that even in a backwards fall she's more likely to sit down very hard and hurt her coccyx than to hit her head. And if you can get her a couple of lessons it will probably make a huge difference. There's a lot more technique involved in skating than in cycling.
Backward falls are typically a symptom of bad weight distribution, incidentally, and will become much less likely the better at skating she gets.
Backward falls are typically a symptom of bad weight distribution, incidentally, and will become much less likely the better at skating she gets.