Maybe a photo of her favourite corgis
Or, a foil-wrapped dog biscuit?
Surely, a collapsible crown.
A fold-up tiara  would be
more practical -  I guess.
Her Majesty loves horses, so a
carrot or two is de rigueur.
Spare ******  would not go amiss.
Emergency use false teeth? Possibly.
As much as one can surmise,
pearls would not surprise.
Predictably, a ready made speech
on neatly folded vellum  beginning
with the words: "My husband and I."

If I could be so bold – Ma'am -
I suggest a personal alarm.
A spare pair of gloves too;
all those sweaty handshakes.
But so as not to make you huffy,
in case The Poet Laureate may know
What's in The Royal Handbag?
I’m going to ask Carol Ann Duffy.