Looking at the first picture she is a biter? In which case I would suggest 10 days is good because I can guarantee they have spent half their time in her mouth lol
The length looks fine, but I would soften the corners, make them less square - firstly so they are less likely to catch something or be knocked, secondly there's less for her to 'play' with.
I always recommend weekly visits for biters with new extensions, that way you can see how they are coping and don't forget a biters nails will always grow faster. And is she using her cuticle oil at least twice a day?