Yay finally bloodlines and horses I KNOW!
What are you purchasing her for??
Landgraf I know very well, my horse has double Landgraf on the dam side and he always throws a big jump and a big neck.
Fabuleux seems to also be a jumping sire, funny he would have some dressage lines. Absatz and Wendekreis are two great sires, more dressage lines though.
As far as purchasing the filly at two, if she is nice she will be gone by then, or her price will double or triple. The longer you wait to buy a foal, the higher the price is going to get. At 3 for a nice horse it's not hard to spend $25,000US because at that point it's broke and it is almost for sure that you know if the horse is a gooder or a dud.
If you are buying her for jumping, I would look around for a horse with fewer dressage bloodlines, although she does look like she's going to fill out fairly well. Her mother is a born and bred jumper, the sire I would think is about 50/50 as to whether he throws dressage or jumper horses.
For dressage I would scoop her up. I love jumper lines in a dressage horse. And none of these lines are known for being really hot or thick in the skull. Her sire looks very ride-able and I'd ask what her dam is like, or the horses she is throwing, when they are being ridden.
And just a PS when they are really tall while they are young, this is not necessarily a good sign. It can mean that they grew too fast and are going to have bone/joint damage, or are going to end up filling out late, or just growing huge neither of which are really desirable. On the other hand she could just be a big foal.
Also keep in mind with purchasing a mare, your resale market is going to be greatly reduced and you do have a higher chance of ending up with a "trainer only" horse. You really need to make sure she has an easygoing temperament.