What DOES she like?
My husband hates icing and fondant too. It's ideal for me to cover a cake in fondant for him, because when he peels off the fondant, the icing comes off with it.
Didn't think of that. 
Problem solved.
She does like chocolate but she wants the cake to be pink and brown.
Well, if you do cover with ganache that would be brown. You could make white chocolate modeling chocolate and tint it pink for the decorations since she doesn't like fondant.
"Hello, Sis? I want you make me a cake. Pink and Brown decorations. But don't use any kind of icing because I hate both kinds. But you DO have to decorate it the way I like. Do-able?"
"Dear little sister: Bite my butt. Whatever you don't like, you can scrape off. Otherwise, you'll just get whatever the he!! I decide to make for you. Luv ya! 
"
"Hello, Sis? I want you make me a cake. Pink and Brown decorations. But don't use any kind of icing because I hate both kinds. But you DO have to decorate it the way I like. Do-able?"
"Dear little sister: Bite my butt. Whatever you don't like, you can scrape off. Otherwise, you'll just get whatever the he!! I decide to make for you. Luv ya!
"
I have a sister like that too..everything I make she says hers is better. All the cakes I do, she manages to point out all the flaws and says she could do better (she doesn't do cakes). She just mentioned that other day that I hadn't made anyone in her family a cake for a looooong time. Hmmm wonder why.
"Hello, Sis? I want you make me a cake. Pink and Brown decorations. But don't use any kind of icing because I hate both kinds. But you DO have to decorate it the way I like. Do-able?"
"Dear little sister: Bite my butt. Whatever you don't like, you can scrape off. Otherwise, you'll just get whatever the he!! I decide to make for you. Luv ya!
"
This is hilarious!
"Hello, Sis? I want you make me a cake. Pink and Brown decorations. But don't use any kind of icing because I hate both kinds. But you DO have to decorate it the way I like. Do-able?"
"Dear little sister: Bite my butt. Whatever you don't like, you can scrape off. Otherwise, you'll just get whatever the he!! I decide to make for you. Luv ya!
"
This is basically what I said to my cousin, who will be celebrating her 19th birthday on Monday. I missed her 18th (I was in hospital, having given birth to my son just the day before - acceptable excuse!) and I was supposed to be doing a cupcake cake for her party. So to make up for it I'm making a cake for her birthday this year - and so far she has complained about every suggestion!
I love her dearly but I'm worried I'll end up dunking her head in the cake after giving it to her
(ps. Hello all! I've been lurking for quite some time.. thought I might start posting )
"Hello, Sis? I want you make me a cake. Pink and Brown decorations. But don't use any kind of icing because I hate both kinds. But you DO have to decorate it the way I like. Do-able?"
"Dear little sister: Bite my butt. Whatever you don't like, you can scrape off. Otherwise, you'll just get whatever the he!! I decide to make for you. Luv ya!
"
lol, You're so funny, but I agree
I guess you could try either marzipan or modeling chocolate. Neither of them work quite the same way as fondant does, but their taste is different. I'm making a cake with marzipan right now and it's delicious! Colette Peters recommends mixing 50/50 fondant and marzipan in order to cover a cake, ensure your colours stay true, and still get the marzipan flavour. If you do that, go heavy on the almond extract.
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