Your point is not backed by anything, rather than your own interpretation of the canon.
If she had Eyir she could have made as many Valkyr as she wanted, that meant saved forsaken and Saved Sylvanas. The argument that she chose her people over herself, is just as applicable with the points made.
The law of the Forsaken isn't broken if Eyir wasn't a forsaken.
Edit:
Use WoWpedia, not WoWiki.