Sorry, but I don't think the OP is being unreasonable. It's up to her what time she gets up. If her dd doesn't wake up until after 8.00am, then there is no need for her to be up.
Just because others on here may get up due to jobs, school or early rising children, doesn't mean that the OP should have to do the same! Wouldn't you all take the opportunity to lie in if you could? Anyone who says no is a big fat liar
My dd doesn't wake up until 8.30 many mornings, and so, if I'm not working, I don't get up until she does. It would royally p*ss me off if the postman was knocking on the door with parcels that weren't mine, when I had the chance to lie in.
I think it's entirely reasonable to take in a parcel once in a while, but if it's a regular occurrence, then the neighbour needs to think about alternatives, like arranging to pick up from the post office, or at least, grovelling wildly to the op and buying her copious amounts of wine and chocolate!