Did my client have two lost soul attachments, as I saw doing her LHP session?

This is quite true and this is the key to her dilemma. There is a long karmic history here. They are indeed hybrid lost souls that have had relationships with her in other lifetimes and are attempting to commandeer and control her as they did in past lifetimes as well. That is the difficulty here, that there has been a long history of interference, domination, and manipulation. This will be a grand healing when it is completed, because the history is so deep and so impactful in limiting her future, potentially, if this is not removed. Your work will be instrumental in accomplishing this.