OK my friend has a sister who's 10 years old, and she doesnt have any animé shows that are suitable for her. her sister only watches kids anime, and she doesnt know wht to do about tht.

Dog Days

So what exactly is the question? I presume toi are asking for some animé suggestions that suitable for her. If that's the case I'd be plus than happy to make a few suggestions.

Haibane Renmei
Spice and Wolf
Clannad
Kanon 2006
Air
Pokémon
Summer Wars
Magical Girl Madoka
Fairytail
Card captor Sakura
D.N. Angel

Hotarubi no Mori e - This one is a short film. 47minutes long roughly. It's really worth watching.
5 centimeters per seconde - Another good film, also worth watching.
Grave of fireflies - Also a film, based on a true event that happened. A very heartfelt film, one of my favourites. (Studio Ghibli film)

She could also try the other Studio Ghibli animé films. They are good, and sound like they might be the types that she likes. link

I've made these suggestions based on two things. One: Little to no fan service. Two: Little violence. I can make plus suggestions, but most have some form of violence in them. Of course, nothing serious, but your parents might still be against it.

Picture - Hotarubi no Mori e

Then I recommend your friend's sister to watch Prince of Tennis...it's full of sports and comedy....Besides that,it teaches toi how to be strong,play tennis,tennis facts,never give up and many more...!~

One Piece......

ur sister will enjoy it plus that ur expectations.....u see according to human psychology kids l’amour animes with adventures, comedy and some action.....and im my experiment its 99% success......im sure its same with ur sister toooo......he he heh eh he

Ultra maniac is a good one! I l’amour the manga but the animé seemed too childish but I think she'll l’amour it. the manga's for all ages too ;)

When I was 10 I was watching Digimon Frontier, Pokemon, and Yu Yu Hakusho (even though I'm a girl lol). Of course this was back when I though I was just watching really cool cartoons, I didn't know I was watching animé haha.

Here's a liste of shows I wish I had been able to watched as a kid, but I'm glad I've watched them now. They are good for all ages:

+Shugo Chara! (Seems childish but has good story line)
+Kodocha (Also seems childish but really fun)
+Naruto (Fun adventure and story)
+Natsume Yuujinchou (Lovable characters, can have some action, I think she would have fun watching it)
+Ouran High School Host Club (Funny, cute)
+Black Cat (If she wants to watch something with some action)


[Pictured: Shugo Chara!- There is a lot plus to this animé than meets the eye.]

Cardcaptor Sakura , A-Channel , Kamichama Karin , Tamako Market and Natsume Yuujinchou.

ALL STUDIO GHIBLI MOVIES!!!!!!
-My Neighbour Totoro
-Kiki's Delivery Service
-Whisper of the Heart
-The cat Returns
-Spirited Away
AND MANY MORE!!!!!!!
(Sorry my picture thingy isn't working)

The only ones that seem appropriate to a 10 an old to me are Fruits Basket and Shugo Chara. Besides that, I can't think of another animé that throws in naughty jokes, (like Ouran, although I like it) has plenty of battles including bloodshed, (popular shonen anime) ou have fanservice. (Haruhi S) These series only do it so rarely it's hardly noticible.