I might be wrong, but I thought I read a spoiler that Robin Hood would appear in both Once and the WL spin-off. If so, then I could see Lauren’s character being affiliated with RH.
ETA: After doing a quick search, I found an article confirming that not only will Sean Maguire appear in OUAT S3 but he will also appear in OUAT in WL!
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy