Do you think she wants to lose like that? Perhaps she is not quite good enough to win a major yet? Shock horror.. She is doing everything she can to win. Winning a major is a MAJOR achievement, only achieved by the very best players, playing their best tennis.
I think its unhelpful to question a player like that on the day (sometimes moment) of defeat. Anyone who has played any sport to any sort of level will tell you how much it hurts, and I am often surprised at how well professional sports people handle themselves in interviews after defeats. The British public does not own her. She is a professional tennis player who happens to play for this country.
No one wants to lose, and although the question does have merit, perhaps it's best left till a little later?