No, she knows Markus is lying because of two reasons.
Appearance: His vault suit is visible and she is perceptive enough to notice.
Markus' statements:
- "We are from a small village south of here. We're just exploring and mean you no harm."Generalised statement with no details, evasive, this is his response to her initial question of where they are from. Coupled with the vault suit, dead ringer for someone from a vault.
- "Oh, these pants? You see, we are collectors of old vault technology. Since you seem to know so much about vaults, you don't happen to know any vaults in the area, do you? Or perhaps people who trades or collects this stuff like ourselves? As you can see we already have vault suits, those are of no interest ot us, we are interested in tech, more specifically computer parts specific to vaults, perhaps water purification systems."He is from a village yet he's after high tech information, your average village has people getting by and dealing with local wasteland problems, the class between village and hunting high tech is incongruous. Also, super weak explanation for vault suit. This confirms it well and truly. With her level of intelligence these are fairly easy conclusions to form as opposed to me presuming knowledge for the character.
I'll edit the post with the info you want witheld, then after Carib gets a chance to reply I'll write Lyla leaving them to it.