Need some help.
Most Helpful Girl
What kind of relationship do you have? I mean if you are close enough you can just ask her and she how she reacts otherwise you should really think what you know about her and if she is the kind of person who would appreciate this gesture. Of course you can always send her the poem anonymously and give her some hints when you have a conversation with her afterwards, but just like I said before it all defends on how close you already are
Most Helpful Guy
Ask her if she likes poems, if she does find some poems you like and read them together.