It took a while to find the text of the amendment, but this scenario would seem to be correct.
However, my question would be, in what way does this mother's behavior constitute a "Christian belief or practice" (which is what you are claiming is threatened by this bill)?
She might say, "You are a no-good homosexual." Is that something a freethinking liberal would say?
Who believes homosexuality is wrong?
Right.
Christians.
I suggest reading the statement by the Republican Policy Committee.
http://rpc.senate.gov/_files/CRIMEcr071503.pdf
Traditional Values Coalition also has alot of info on this.
http://www.traditionalvalues.org/modules.php?name=News&file=article&sid=1697