Off the top of my head: Only having the Outer Path's powers, Black Receivers and power over life and death, with the second one watered down to being better at medical Jutsu and reincarnation techniques than otherwise due to it being an incomplete replica. She either can't get the other powers or has to go through special effort to unlock the Six Paths. Things like Limbo Border Jail are flat out impossible for her.

Another option is that the "active" paths(Deva, Animal, and Preta) only have their basic abilities(Push and Pull, summoning without blood or hand signs, and basic chakra absorption) and not their bigger flashier powers(mini-moons and summoned meteors, giant monsters that are an extension of yourself, and the barrier that negates all Ninjutsu,) the King of Hell refuses to use it's full power on her behalf becuase she's not the "real" Sage(so tongue ripping is merely painful, not fatal, and she can't use it to raise the dead,) Human Path can only read minds, and not perfectly, not rip out souls, and Ashura Path has fewer missiles and no canons(or maybe takes advantage of her extant powers instead of the machinery.) In which case she only has Black Receivers, not the Outerpath's powers over life and death.

Another is that she has the full power... But because of some flaw in her recreation, she can't use them by herself and has to imbue each path into a separate, willing person using Ninshu to create a permanent connection between them(meaning she needs to learn Ninshu) as a variation on the Six Paths of Pain... With the caveat that each individual is their own person with free will