Not here to comment on Sylvie's behaviors, motives, and attitude on this board. Instead, I just wanted to add my bit on my comparison between Sylvie's book and the Treppner course.
I know it's been suggested over and again that a beginner should start and stick to one system before branching out so as to prevent confusion, etc. I do think that advice has a lot of merit and I also agree with it (to a certain extent), but I thought I'd share a little from the POV of someone who looked into both simultaneously. (By the way, I'm not touching upon her study group here... just purely her book and the Treppner course)
My overall opinion is that they both actually complemented each other for me. Here's a couple of points as to why that's the case (again, for me):
1. Sylvie's book, while great for breaking in a beginner onto the basics of reading with the Lenormand, lacks quite a bit of information in several areas. I see her book more as an elaborate decent LWB- it gives a panoramic view of the Lenormand, card meanings, and jumps right into her No-Layout spread. You get the basic gist of things but you get the feeling A LOT has been left out- some she even admits to and says there's too much info involved to explain in her book.
In short, her book is great for pointing you in the general direction and you'll be able to experiment with readings right away. I had a lot of fun starting out... but once you really get into it, you might soon notice that her explanations in the book itself is not enough to get you beyond the basics.
Here's where Treppner's course comes in. The course actually goes into a lot of detail and covers a whole bunch of stuff that Sylvie's book was missing. Reading the course, I felt like it filled in a lot of holes. Some useful info I especially liked that Sylvie never covered in any detail was the use of the Grand Tableau (36 card spread), reading and developing combinations, how the order of the cards affect a reading, the "people" cards, which cards could potentially change or affect which ones, etc. There's a whole lot more like various methods of interpreting and all that too.
2. For the most part, Treppner's card meanings and Sylvie's card meanings are the same. There are a few differences... and contrary to the general opinion that this will confuse a beginner, I actually like that I was able to study the differences because it helped me take a step back and decide for myself which one clicks for ME.
For example, Sylvie's use of the Fox card to depict work/career never meshed well with me right from the beginning. I understand her reasons behind it, but try as I might to see it in relation to work, I will only ever see it as an odd job here or there at most but not an actual work/career card. When I read that Treppner uses Anchor instead of Fox for work, it immediately made sense to me and I'm glad I had an alternative to work with. Likewise, I think both systems actually gave me a lot of food for thought in terms of what a card can mean... and that has been greatly beneficial for me.
Summary: I think Sylvie's book was great for me in terms of introducing me to the Lenormand and getting me started right away. It's beginner friendly, but I say this hesitantly because I think it might not be as easy to understand for someone who has little experience in reading cards in general. I think it was easy for me to jump in and look over a lot of things she missed because I already read a fair variety of card systems (Tarot, playing cards, Gypsy cards, Kippers, other oracle cards) and some of the "practices" have a common ground. I imagine it would confuse newbie card readers a lot more though.
Treppner's on the other hand covers a lot of basic stuff that a newbie could benefit from... but it also quite quickly throws you in the deep end, so you might become overwhelmed by the wealth of info. But you return to it often as you improve and I think you get a lot out of it in the long run. So really, they both worked well complementing each other for me rather than against.
I enjoy both systems' way of reading and I use both (among others). Sylvie's system, I've found, to be the simplest so you catch on fast, especially after the little missing holes become clear to you. Most important of all, they both
work for me and in combining the two, I think I've come out with a better understanding of the Lenormand than I would've if I had been missing one or the other.
Hope this (lengthy) post was helpful to someone.