Was Rey amped against Palpatine?

Were all the Jedi spirits literally empowering her, or did they just give her a pep talk?

Which one would break the story even more?

She was likely amped. Before that, she and Ben were ragdolled by zombie Palpatine. An amp is the most logical asumption.
The jedi amp is a deux ex machina and creates some plot holes like why didn't they helped Luke in ROTJ?

"All of the Jedi stand with you."

yes it was amped

Pretty sure yeah. From what Ant told me of the spoilers, she was intended to be amped by the Jedi helping her. Though this is in early drafts, and they could have changed that.