I kind of had the impression that Belle understood who her captor was when Regina was peering at her from outside the door of her “cell” in the looney bin. It looked like there was a look of hatred on Belle’s face when she saw Regina. Now that doesn’t necessarily mean she knows who she is – it could just mean that she hates being locked up and assumes that Regina has something to do with it since presumably Regina has been peering in at her before.
Also, do we know that kissing would be a problem for Mr. Gold and “Belle” in SB? Since Mr. Gold’s status and power in SB seems to be tied to the promises the EQ made to Rumple when he was locked up in his special prison in FTL – for comfort and power, etc. – and not to when he became the Dark One it doesn’t seem to me that kissing him would have any effect on him in SB. If that was the case then kissing should have effected David and MM in SB – which it didn’t. If kissing Mr. Gold were to break a curse – then wouldn’t it be the Dark Curse that the EQ enacted that would be broken?? And I think that we have already proven that kissing doesn’t work on that curse. So I don’t think we have to worry about Belle and Mr. Gold not being able to kiss (please, GOD, let us not have to worry about Belle and Mr. Gold not being able to kiss.)