It could be that the person just uses what she finds around the web that she enjoys; I don't see anywhere that she attributes the poem to herself or says anything about it. I think if she "borrowed" your poem she might have borrowed the others (why they're all uniformly "good"); I would leave a comment on her blog page where your poem is and/or send her a PM through her site suggesting she mention at least what site(s) she borrowed poetry from, if not try to start a conversation with each owner and ask to use it on her blog. I think she might be young/a teen, from the graphics and all?