It should perhaps be noted that while the high elves are very powerful and knowledgable, their arrogance far outstrips their ability. They are not nearly as good as they think they are.Like if the puppy picked up a marker in its mouth and started drawing differential equations on the whiteboard.
Just because they look down on Mathilde doesn't mean they are actually smarter than her. Note that the Asur have been fighting greenskins for something like ten thousand years and never worked out the trick to screwing with a Waaagh field.
Runesmith specifically? Difficult. We already have top quality runic equipment.It might be an idea to start brainstorming what Mathilde would do if she had a shitload of Runesmith Favour to burn.
We could commission runic items for other people. Upgrade the other seven reclamation blades to Rune Fang equivalents. Supply a bunch of anti-Dhar belts to the Colleges. Something like that.
Or we could try to push them into progressing. Have them investigate what runes can be usefully put on a gyrocopter or steam tank. Getting one of the best Runelords to go all in on runes for engineering would be a powerful precedent.