Hi crazylazydaisy
I'm involved in the UK poetry scene, and I know a lot about getting published.
At your daughter's age, she needs, mainly, to work on her craft. She's unlikely to be ready for publication, especially if she writes rhyme-y verse, as tends to be the case with children her age, as that's often the only poetry they've read, and that's what they associate with poetry.
However, her best path towards publication, besides working hard and reading a lot, is contests for young people. But they have to be reputable contests. Beware of scams, of which there are many.
The Poetry Library in London has a great website which lists reputable competitions. They've a special section for children. Below are the children's competitions currently on the Poetry Library website:
this one is for poems of bereavement
and this one is for poems about anything
The Poetry Kit website also lists competitions for children. (And they've a little advice section for avoiding scams.)
If your child wins enough (reputable) competitions, her work will get noticed. The most important competition for children in the UK is the Jerwood one, sponsored by the Poetry Society. (Check out Poetry Society website for details). A young poet now published by Carcanether second book came out and she is 20! her first when she was 16!was noticed when she won the Jerwood Prize twice. But she's a genius.
The best thing you can do for her is encourage her. (Do they do much poetry in her school?) And maybe try some competitions too.