How do I tell someone I had a shoot with that I will not send them the RAW files as it wasn’t a paid shoot?

I shot recently with someone where both of us have wanted to work together for a while, thus i didn’t charge. However after the shoot i’m sending her the pics as I finish them and she’s asking for the RAW photos. How do i tell her i won’t send them because if she posts them i only want her to post the versions i send her- again as the shoot wasn’t paid, i only my “best” work to be shown, not her version she made.obviously i don’t want to come of rude or anything like that , just looking for advice :) via /r/photography https://ift.tt/2SYYeUi