Offer [i]ignored[/i]. :lol

That's actually a pretty good idea. The the only thing would be whether they were kept in Frelia, by Eirika herself, or left in Renais. 

If it helps the Jehanna weapons are the Ice Sworld Audhulma and the Anima Tome Excalibur. If she's going to be a myrmidon/swordsmaster then the former would definitely have more use to her. However, the other would have just as much value in significance without making her "overpowered."