It’s basically up to the person running passport control that day but first of all they also need their other travel documents like their passport if they are flying internationally.

They are often not allowed access to them (Not denied access in any legal sense, but their families will “look after” the documents making it hard to gain access to such documents). But if it’s the case of a foreign national returning home their home country can provide emergency travel documentation and help see the person thought passport control.

But if they are not a foreign national, they have little options. They will often (but not always) try and contact the legal guardian of the woman (if they are not already present, but as you said without the app. I presume they are also travelling without their “legal guardian”) and return the women to their family if they are instructed to do so by them.