I’m not so sure we’re going to see Snow and Cora interact right away. Snow is unconscious and Emma certainly wouldn’t know who she is.
I don't recall seeing Cora in the next episode preview, least of all with Snow, but there does seem to be some Snow and Emma running around free so I'm thinking Cora somehow helps them get out – without Snow waking up – as part of some bigger scheme
Non spoiler based speculation: Could Cora be the thing that prevented the curse from affecting that corner of the Enchanted Forest? I mean, she’s there and we know she’s good with magic, maybe she did something?