I mean its made abundantly clear by shadowheart you shouldn't trust her.
If you pass the perception check with Zorru you know shes hiding something.
If you actually talk to Lae'zel you learn shes the equivilant of a highschooler and probably knows the least out of all the companions.
When you see the dragon by the bridge the party says they should maybe turn back
When you get to the bridge now there is a teifling that tells you to run.
If you miss all these red flags I think most DM's would be fine if you got whats coming to you. Granted I wouldent take the group, but this is a game where you can reload. Can't do that in tt.
Shadowheart is also dodgy AF, a worshiper of Shar who has a mysery object and a mystery mission she won't say anything about. Why should anyone trust her over Lae'zel?
Literally every single character companion is hiding something. Not trusting any of them on this basis would lead you nowhere. It's not about trust of the character, it's about the logic of what they're saying being plausible. Just because LZ doesn't know all doesn't undermine the basic experience of Gith with MF - there's no other race that should know more about them. The stuff LZ says in this regard is extremely plausible, and there are books on the Nautiloid that talk about the Gith - MF history if your character was previously ignorant of that.
You can see the dragon is in the area from the druid grove (via telescope). By that basis why even leave the grove? The dragon could see and get you anywhere if it's against you. If you're trusting to LZ then it's not a massive factor either way.
The tiefling isn't much of a muchness either way IMO.
Yes, there are reasons for not believing and ignoring LZ. But any party that chooses to have her in it also has pretty reasonable logic for going down this path.
And at the end of that day this is also what a lot of players do - the number of comments and suggestions on this issue on these forums and elsewhere demonstrate that this is a common response new players have.
