A slight increase of the security of the currently only heir is a big deal, and one that a lot of her peers and high level friends will understand the value of, and it is only really a 10 to 20 year commitment. Not to mention the tutor role is also important, and having a wizard in that role is a big deal.
If Sylvania stays a quagmire for a generation, it is not a big deal the way the difference between a good and bad heir to the throne.
That said, if you care about what other people think, ambassador at large is something that just about all in world opinions would approve of due to her near unique connection and level of respect there (perhaps the best since Sigmar), but it has not really captured the threads imagination.