She cannot stop them both from leaving. It's not her choice to make for them. Besides, they are both big, burly men. The only thing she could possibly do is to jump onto their backside and hold on for deer life like a little spidermonkey. However, were she to do that she'd likely end up in Winter's world.

"Winter. Please. Think about it. Our worlds aren't yet touched by these horrors. I know it's tempting but please, stay."