Don't worry about kids or baby yoghurts. It's just another reason to charge more.

Find the most natural yoghurt you can and give her that.

We love Jalna here and Mungalli Creek (from the health food store or deli).

Recently. I have successfully made my own yoghurt with those as a starter (no yoghurt maker, I just use an esky filled with warm water). I make 2 litres at a time. No powdered milk or other processed stuff. Just yoghurt and full cream milk. If I want it particularly thick and creamy, I strain the yoghurt through cheesecloth which gives me Greek yoghurt.
It is absolutely divine, no effort and cheap as chips. And way more natural than any of the kids' yoghurts.

I add some natural Raspberry Jam to make "pink yoghurt" for my pink-obsessed daughter. Or pureed Manngo. or a few drops of Flaxseed oil and honey.
Or garlic, grated cucumber and a little dill for a refreshing Tzatziki dip.