I saw the Practice episode a few years ago. He also argued that she wasn't a JW because she didn't carry a No Blood card, saluted the flag, etc. etc. It was very well researched. Actually, I thought the attorney who argued the case proved pretty conclusively that she wasn't a JW anymore (even my JW parents, who I watched the episode with, agreed). But the judge ruled in the mother's favor, and there was no blood transfusion. It ended up not mattering anyway, because miraculously, everything was alright and she woke up from her coma (of course - it's TV).
Strangely, nobody in the episode thought to ask her upon waking whether or not she actually considered herself a JW or would have accepted a blood transfusion. So there's no plot resolution there.
The pilot episode of Lie to Me really botched the JW portrayal bad. They got the lingo wrong and everything. My parents watched that episode (because they thought the show looked interesting) and then vowed never to watch again because of the way JWs were represented.
Scrubs also did an episode with a JW character who refused a blood transfusion (transcript here: http://scrubs.wikia.com/wiki/My_Half-Acre_transcript). I thought Dr. Cox's frustration in dealing with this woman was very well represented. Although, of course, in the end they found a way to treat her and she lived and all. Because it's TV.