She's used to a crowd and looking after seven dwarfs. I think she can handle a bunch of teenagers, haha.

But yeah, that could work. Snow has pretty much been neutral on things from the start given Regina was here and all and she really did not want to go down that path of warring against her stepmother again. But if Sansa is pledging to work towards neutrality and attempting to try negotiate/provide safe haven for people in the middle of it all she'd be willing to help. I think she'd understand the self-preservation thing even if she might be a little upset. She understand some things take time to earn trust and all. After all, she's been on the run and had to lie herself in the past.