So IOTL Queen Elizabeth was offered the Dutch crown, but she did not accept it.
According to Wikipedia she did not accept it because of her failed interventions in favour of the French protestants. But say she never intervened. And then accepted the Dutch crown. How would the Dutch was of independence play out? How would the thirty years was play out?In 16th-century Europe, most countries had a king or other noble as head of state. Having repudiated Philip, the States-General of the Netherlands tried to find a suitable replacement. The Protestant Queen of England, Elizabeth I, seemed the obvious choice to be protector of the Netherlands. Elizabeth, however, found the idea abhorrent. Her intervention for the French Huguenots (see the Treaty of Hampton Court) had been a costly mistake, and she had resolved never again to involve herself in the domestic affairs of any of her fellow monarchs. Not only would intervention provoke Philip, but it would set a dangerous precedent. If she could interfere in the affairs of other monarchs, they could return the favour. (Elizabeth did later provide aid to the Dutch rebels in the Treaty of Nonsuch (1585), and as a consequence Philip aided Irish rebels in the Nine Years' War.)