Sorry I’m not upon Children’s apps....
As she not a profiecent reader yet how about letting her watch/listen to TV shows that she knows with sound to CI alone, or using YouTube kids videos. Try 10 - 15 mins at a time.
have you got any children’s audio books, or do any of her books have CD’s etc that go with them that you can play for her whilst she looks at the book? Again there are a naumber of Children’s audiobooks on YouTube too, but it’s best if you go through and select some first to make sur they are appropriate.
Good luck!