Because she is a weak feeble puppet. A product of her families fears and government controll. Dont forget, the royal family are UK property. Owned by the government, history and society, destined to do their bidding, without any will of its own. Witness thew marriage of Charles to Dianna. A totally arranged marriage. And only arranged because a marfiage to Camilla wouldnt be tolerated. Same as Edward and Simpson. A marriage to a commoner, even worse an American? No way. So the queen canot do anything that hints of personal feelings. She isnt allowed to have any. She must always present the correct image, thats why she cant donate. Nunc est bibendum