The bottom line is that anyone can call themselves whatever they please. If people call themselves apostles, then they need to be seen to be fulfilling that role. But that is not for us to judge. There is a day of Judgment coming, and we all have to stand before Christ and give our own account for what we have done in our lives. There is a warning in Scripture for us not to be many teachers, because those who take on the teaching role have the greater responsibility at the Judgment.
Also, the foundation of any ministry is the preaching of the true Gospel of Christ which involves what Christ has done for us on the Cross, and that those who embrace Christ need to repent and believe the Gospel. If the "apostle" leaves out or ignores the Gospel in the process, then she might end up being viewed as preaching another "gospel", creating a problem for herself at the Judgment.
If in the process of casting out demons, the post-demonized people are transformed to be stable believers in Christ who go on to live as true testimonies for Christ, then her ministry is useful and will be acknowledged and rewarded at the Judgment.
But there is a danger of judging ministries before the time. This means that those who judge the apostle when God is not presently judging her may be usurping God who has prepared His own day for judging us all.
My view is that if the apostle is accepted by her own group of followers and people come to her for ministry believing that they can be helped and set free, then we who are not part of her group really have no basis for judgment. As Gamaliel said to the other religious leaders concerning the early church, "If it is just a passing phase it will fizzle out in time, but if it is really of God, then we may be fighting against God Himself". Very wise advice, which many of us should take on board when commenting about the different ministries that we view on YouTube.