Um...ok. I usually hand-write my letters (my handwriting is really neat). since this is for Idina, i would most likely send a Self-Addressed-Stamped-Envelope. just tell her your thoughts about the show and her performance etc. Idina replies really quickly, so maybe expect a reply within a few weeks or less. i'm not sure what you will get in return, but i think that you are mostly likely to receive a signed picture.
"People asking questions, lost in confusion. Well I tell them there's no problems, only solutions."
~The one and only John Lennon