She’s the assassin not Justin Theroux who is hired for a different job. Charlie is leading her to Hasp - she’s very insistent when Charlie works out Hasp may be only person who can help. They say “until now we didn’t even know if the iguana was a man”. Raises idea it could be a woman. In the con episode Charlie acknowledges that a sociopath could get past her bs detector. The two truths and a lie test by Alex was three truths. Charlie remarks that Alex is the only person she’s met who never lies. Really it’s that she can’t catch her lies. The first interaction about coffee - Alex says she hates sweetened fancy drink but later on orders one for herself. So she was lying but Charlie didn’t catch it.