Confused about what's happening here? Don't be. A medievalist can explain. + 
A handy thing in medieval kingship was the use of the queen as intercessor. Women were conventionally ascribed softer hearts and subjects were encouraged to appeal to the queen for mercy.
For example, in 1450, after a revolt known as Cade's Rebellion, King Henry VI offered a pardon to many participants (I mean, he also had many executed, but her pardoned others).
Now that makes a king look weak, right?! No king wants that.
So, In the preamble to the text of the pardon, the king claims to have been moved to this gesture of clemency “among others, by the most humble and persistent supplications, prayers and requests of our most serene and beloved wife and consort the queen..."
This is very handy for a king. He gets to keep his strong profile while pretending to be moved by his wife. This happens habitually in the late Middle Ages. It's a trope! Read Paul Strohm's Hochon's Arrow for a chapter on this. So +
What does this have to do with POTUS? Well if the current situation with forcing immigrant children into internment camps looks untenable (by which I mean politically inauspicious for him), this becomes part of the apparatus for alibiing a change in policy (you know, HIS policy)
There will no doubt be a whole, complex machinery for framing the change-- if such a change occurs, and I hope it does and fast, and I don't care how it comes about, we just need to save this children--but this is planting the seed for that potential.
And in the meantime, she becomes the benevolent spokesperson for a cruel regime, presenting a kind image that suggests current policies are driven by pragmatic concerns with the best interests of asylum-seekers and Americans in mind (they're not).
