Photograph her like someone else has to recognise her
Keep a recent photo set for your Plymouth Rock that a stranger could use, not just snapshots that please you. Take both sides in plain daylight so the barring reads clearly, a shot from above showing the width and pattern of her back, and a close head shot capturing comb size and shape, beak color, and eye color. Add her feet and legs, including her band and its number if it shows. Retake the set when she molts, gains or loses condition, or injures a comb or toe, because a missing-bird alert built on how she looked last season can cause a finder to rule out the very hen standing in their garden.
Write the details photos cannot carry
Alongside the photos, keep a short written record: her leg band number and color, her age, whether her comb is single and how it sits, and any individual mark — a bent toe, a chipped comb tip, a patch of paler barring, a missing claw. Note her size in plain comparison, such as the largest hen in the flock or smaller than the other Rocks, because finders judge by comparison, not by breed standards. Add the phone number to call and a second contact if the first might be at work. Keep the record as one page or one phone note that can be forwarded whole, without editing, under stress.
Record the habits that tell searchers where to look
A Plymouth Rock's routine is search information. Note where she roosts, where she dust-bathes, whether she comes running to a particular call, shake of a feed container, or person, and whether she tends to hide when frightened or keep foraging openly. Note the gaps she has tested before — a loose run panel, a gate that swings, the corner by the compost — because a missing hen often leaves by a familiar route and settles nearby. Add the names or addresses of the neighbors most likely to find her, so alerting them is a task already listed rather than an idea you must invent while worried.
Keep the set ready to send in minutes
Store the photos and the written record together, backed up off the coop as well as on your phone, and check every few months that the files open and the phone numbers are still right. Share a copy with whoever feeds the flock when you travel, since a hen is as likely to go missing on a sitter's watch as on yours, and the sitter should not have to guess her band number. Practice sending the whole set to yourself once; if it takes more than a couple of minutes to assemble, it is not ready. In a real search, the first hour matters most for a chicken exposed to dogs, traffic, and nightfall.
Update the packet after every flock change
Treat the packet as a living record. When a band is replaced, a hen is rehomed, a new barred pullet joins the flock, or a bird's appearance changes after illness or molt, update the photos and notes that same week. An out-of-date packet can misidentify a hen just as badly as no packet at all, especially in a flock of similar barred birds. The discipline is small — a few photos and a page of notes, refreshed as she changes — and it converts a frantic, vague search into a precise description that neighbors, and anyone who finds a barred hen, can act on immediately.
With that packet prepared, KinsLe's Lost Pet Alert System lets you alert nearby Circle of Love members free at once, and a finder who recognizes her can message you directly.