I actually think that she is neither of known 13 clans of VTM. I actually checked and none of them have obfuscate, auspex and protean (well, according to Marcus, his claws are not a regular protean feral claws either). MC also seems to have a variance of dominate (from what I know dominate requires to look into the eyes, but he controls the girl in the club without looking into her eyes).
Once again, it can be that we are measuring things wrongly, as this is not VTM. In the end, though, even Sharon said that she has not seen such a combination of powers. So while it can be that she has not seen a malkavian, I would find it weird. I mean, if I was writing this novel, I would not make malkavian an unheard clan, given that they are hilarious and give a flexibility for writing the story that is huge.
I do agree that if he were one of the original clans, malkavian seem the most likely, given his visions, though.
About Laurie I think is just a regular thrall behavior. At least that is what I get from Andrew and Sharon's comment.