This may have been discussed earlier....Wh was Hermy at Grimwauld

[jemnilla28]

No: HPFGUIDX 97584

Hermione was likely at Grimwald Place because she wanted to help out 
with the Order. Remember - she isn't bound to go back to her family 
every summer the way that Harry is, so she could simply tell her 
parents that she didn't want to go on vacation with them. I don't 
imagine that a smart, observant person like Hermione would really 
want to be out of Britain at a time like that because she would 
effectively be unable to follow the news of LV (or anything else 
strange).