no-one would have made her do anything she didn't want to do.
With all due respect, do you live in la-la land? If a bunch of drunk, happy, rowdy wedding guests, and the master of ceremonies as well, expect you to behave in a certain way, and you're in the limelight, it's really pretty hard to say No. Of course, nobody's putting a gun to your head, but I'd think it's very much a situation it would be very embarrassing and difficult to back out of.