My take, at the end of a long day:
Between the lines, Collins seems to be telling Reid that she'll vote for repeal as long as the process ties up the Senate long enough to kill some other Democratic priorities.
In other words, she'll allow it to limp across the finish line--but only if she's allowed to put the hurt on Democrats at the same time.
Not exactly "bad faith" negotiating, necessarily. But certainly not "good faith" either.
And that's assuming she isn't simply dithering, which of course can't be ruled out.