They can't go by USPS or common carrier unless she & the person at the other end are FFLs.
(Actually, you _can_ ship your own guns to yourself, but I'm willing to bet that practically NO postal clerks actually know the law, and she'd have her package refused at best, and might have the US Marshals called at worst.)
Best I can recommend is to find someone, or a string of someones, willing to hand-carry them in their own private conveyance from CA to Chitcago. Don't say anything to any government official about transporting this particular private property, or the officials in IL will swoop in on her.
::shaking head sadly:: What has this country come to?
If she's willing to cover the RT airplane ticket, I'll fly with them & ship them as my checked luggage from CA back to Milwaukee, then your friend can drive up here to take posession.