AmyMay
Situation normal
I would say you are letting them know you will be starting to market the pony on the weekend of the 22nd of Feb so they you are giving them warning to prepare the child for the end of the loan but of course if they choose to buy her that’s great .
I would then nudge them by having an up to date photo session in ten days or so .
If the pony suits invest a little time and subterfuge into some nudging it may all work out fine .
The loan doesn’t end until 1st March. So unless the OP wishes to end it early she can’t do a photo shoot prior to that date (unless agreed with the parents), and it would be unwise to advertise the pony until the loan actually ends.