The answer is no, Michael Schiavo has not allowed her to have therapy, even though $750,000 of a malpractice settlement is specifically designated as being for Terri's rehabilitation. He hasn't even allowed them to brush her teeth in the last 7 years.
As to why, well, he can't touch the money till after Terri has died. Although we can't 'know' for sure that this is his motivation, all his actions seem to point to this conclusion. Especially since his claims Terri didn't want to 'live like this' didn't come to light till 9 monthes after he won the malpractice suit. Before that, and at the malpractice trial, all he wanted was "bring her home and take care of her for the rest of her life". You can find what he said on Terri's website.
Also, there are x-rays that seem to indicate that Terri was abused, and possibly strangled the night she collapsed. Wouldn't be to good for Michael if Terri learned to talk and was able to tell what exactly happened the night her heart stopped.
And from the way Michael has acted, it wouldn't surprise me a bit.