I don't label my quilts. I don't think they will ever become heirlooms. Maybe that isn't a necessary criterion but, still, don't label. I make quilts because I like to, and if they get used by a recipient, I'm good with that.

I only labeled a few quilts. I never put labels on any other quilts.

I label my quilts, but not for the purpose of giving information to the fair judges. They are not supposed to see the quilter's name. My name and information are on the entry form and on the fold-up tag that I watch the fair helper pin on the quilt at entry time.

I ALWAYS label quilts. Generic labels ( quilts I don’t know where will wind up, or many sale/ donation quilts) I put name of quilt, my name, City, state, date, fiber content and care instructions. Gift quilts I personalize the labels.
I sew them on the back, usually in a corner where the binding sews down 2 sides, I hand stitch the other two sides.

Lesson learned....I made a baby quilt for a friends daughter several years ago. The focus color was yellow, it was lovely. I did not know mom-to-be had a major dislike for yellow and she sent the quilt to a thrift store. It really upset me. I NEVER made anything for any of her family members again! I was tired and running behind when I realized I hadn't put a label on it. I let it go. I wonder if it had a label if she would have thrown it off?

You should still put a label on it. That way down the years, family will know you made it and when.

Such a sad story. So sorry to hear.