Listening to every heart
It is always a good thing to copyright your work yourself. Dating it at the end of a poem, (c) by Your Name, etc., are all good indications to others who might think they could pass this work off as their own are then seeing how serious you truly are about ownership of your poetry. Also, in the poetry and prose forums, there is an automatic copyright placed there by the owner of this site for your protection as well.
In your profile area, it also wouldn't hurt to leave a notation that your work may be borrowed, once they contact you for permission, and give proper credit. Asking to see a printed product of how it is used is another good example of ownership.
We here at PiP take copyright very seriously. If you or your mother wish to see just how seriously, click on the search button above, type in copyright, leave all forums available, and you will see what we have had to deal with in the last few years.
And thanks...for listening to your mother, and for sharing her concern.
" It matters not this distance now " Excerpt, Yesterday's Love