I'm in the same camp, but it should be noted that it depends how the linen was treated prior to turning it into a garment.

If you're (Justin) sure she threw it into the wash, then go ahead and do that, ditto the dryer.

(When I'm prepping linen for sewing, I wash and dry it on hot a couple of times, and then step back to medium when the garment is done. If I feel like line-drying it, I'll often set it to tumble at low afterwards to remove the stiffness.)