17:01 here. The swing is a GREAT idea! You're also not limited to outdoor swings. You can get the hardware/swings at a therapy store (usually online) but you can also get them from Ikea
http://www.ikea.com/ca/en/catalog/products/S19809351/ . I know they sell it at the Ikea in Woodbridge and they usually have a few hanging in the children's area near the restaurant. My kids love them.
I, too, am puzzled by the therapist's position on signing and cards. I know you said she was highly respected but I would think that if they enable your DD to communicate with others it would be a positive step - one that could be faded out over time. Sometimes a "crutch" is needed until you can do it on your own. That doesn't mean you're going to be using them the rest of your life. I've got a kid with apraxia of speech and have heard that same argument used but our therapists have been very supportive and encouraging of us signing and cards - which we have faded out. He will still sign when he's upset and not able to maintain articulation but it IS communication and that's what we're trying to promote.