It should be noted that the statement put out by Senator Collins (Concerned-ME) says she doesn't think there should be a vote before election day, not that she would actually vote nay if McConnell held it anyways.
At the same time, she did explicitly say that "[t]he decision on a lifetime appointment to the Supreme Court should be made by the President who is elected on November 3rd."
You're right, but again, at no point does she unequivocally say "I will vote nay to any nominee". She is just concerned about the timing. I hope she'll do the right thing for once, but putting out a statement like this and then voting aye would be the most Susan Collins thing to do.