How can she call herself a trainer if she needs someone else to train her?
I already explained that her area of knowledge is with older adults, rather than training healthy people to get strong.
That aside, a competent trainer offers three things: accountability, motivation and knowledge.
Accountability is always good. You have an appointment, you show up. Training on your own, maybe you'll do it, maybe not. When my training partner can't come, I often will miss the session entirely.
Motivation is good, too. And it's absolutely needed to push yourself past your normal limits of effort. No way I'm doing 20 rep squats on my own.
Lastly there's knowledge. Part of knowledge is watching every rep to see it's a good one. You, leachy, have a 140kg squat mentioned in your sig. So let's say you're doing 100kg x10 or something. Will every rep be a good one? You're under 100kg and sweating to get the bastard up there, you sure as shit won't be paying attention to form like someone standing watching will be.
And of course, self-knowledge is a difficult thing. There are times when you are going to want to push yourself harder when really you need to pull back a bit, and vice versa. A competent trainer, watching your performance, they're going to use the brakes and accelerator as appropriate. It's hard to do that with yourself, your pride and fear and mood of the day and all the rest get mixed up in it.
Further to knowledge, whatever we know, someone else knows something different. Markos doesn't spend hours online every day just to promote PTC and mock lazy newbies online, he's reading a zillion articles and learning stuff. There are always new things to hear about, little tweaks or ways to do things that have even very well experienced coaches say, "ah... now that makes sense."
I suggest you have a chat to Nick (NPR) who is a PT/S&C coach, and see what he has to say about working with Markos. Or perhaps have a chat with Max - Max trains other people for money, yet still had Markos coach him to world championship level.
I would be interested to see you tell Nick and Max that they're not real trainers because they have someone else train them. Markos, please upload the vid of it to your youtube channel.