No but I have returned stuff with something like it. Just print out, though sometime the return papers are already in the parcel, stick it on the box. Head down to your local, corner shop in my case, beep the car code, leave parcel.
I think getting a parcel is similar easy.
Best part with the ones I did, was the that owner of corner shop knew me - went past every day and used it often - so some sort of "guarantee" and fast service. So if you could send to a shop where they know her face, it might make life easier.
Best part is that you can collect outside normal parcel office hours, as some corner shops are open until late and even 24/7.
As for secure I would say it is a secure as any parcel handling service you can find. Unless you pay for it to be delivered to her personally, where ever she is when not at home.
EDIT : Valiant has it
