Even Diana had only one sash (the House of Orange Order) and all this because Queen Elizabeth does not grant decorations to female spouses while she did to Prince Bernhard, Prince Félix, Prince Henrik and Prince Claus.
Because of reciprocity then the other head of state does not grant decorations to female spouses either. Queen Beatrix was not that narrow-minded and created Diana a Dame Grand Cross in the Order of the House of Orange (Crown Order), the same Dutch Order as Prince Charles already had.
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The Dutch Order" (in Diana's own handwriting!)
Diana wearing the Order (State Visit Queen Beatrix 1982)