I have been having a think about this and no matter how clever Hermione is I don't believe she planned the bag, tent etc on her own. The evidence for the prosecution is as follows
1. The magic required to create that clutch bag was way beyond anything even a highly trained wizard could perform. Remember Mad Eyes trunk? That was a similar charm I would imagine and he was an Auror with a lifetimes experience.
2. Hermione says that she has modified her parents memory so that they forget all about her and trot off to live in Australia. However after the fight in the Tottenham Court Road cafe she says that she has never performed a Memory charm. Maybe it is me but I would have thought that a modification and a Memory Charm were one and the same.
3. This is possibly the weakest of my arguments. How did she learn all those concealment spells and become so competent at them? This wasn't something that could be left to chance ie she couldn't have read a book and hoped that they worked when the time came. She would have had to have practised them over a very short period of time (since DD died).
4. The speed at which she dragged Harry away from the wedding was frightening. She is, after all, a Gryffindor and would not have run away from a fight unless she was under strict instructions to get Harry out at all costs.
So who do you think it was? I am leaning towards Dumbledore having given her secret instruction just prior to his death, some of which could have been the delaying tactics he mentions. Although part of me wonders if it was Snape leaving helpful hints anonymously (as with the doe).
