When the shield is up, the shield is the orb. The light-hook and the PPO are both incapable of extending (or withdrawing) their function to within the confines of the shield. So no. The PPO generates the beam, but the beam is not fired from the PPO as long as the shield is up.

The alternative is that the shield actually opens up to let PPO fire through, which would mean Very Bad Things for the user, especially in space.
Sorry, but there is nothing so far to support the theory that the Shield becomes the orb.
The alternative is not that the shield opens up, but that the initial phase of the beam can pass though. Just like light can do.
And just like holding a magnifying glass in your hand a sunny day wont do anything. But holding it the right amount of centimeters above will give you a nasty burn.

That would mean that the beam passes through her fingers, without damaging them. That seems silly to me, it's a very powerful beam.
Its less silly than a orb the size of a tennis ball contains more energy than a nuklear reactor (or close to).
Also, see above explanation regarding sunlight and focusing.

Just like how sydney couldnt use her lighthook on vehemence inside her shield, she cant blast something inside it either. Its some sort of security function most likely, to avoid hurting yourself or anything else being protected. The beam does not shoot invisibly from her ppo then penetrate the shield, it is launched from outside the shield (or possible from the shield wall itself) We just saw her shield is not permeable from the inside as shrapnel bounced around in it and nearly critically injured her.
Yes, the orb likely does have a basic security function designed to avoid hurting the user.
But we know the beam is launched from the Orb, since it has been used without the shield orb.
So when you can still shoot the orb despite the shield being in the way. Then the beam does indeed shoot though the shield.
It already likely shoot a few inches invisible to avoid cooking her fingers. Clearly that distance is then extended to get past the shield as well.
Also, se above explanation regarding sunlight and focusing.