That's a separate argument imho. It's not about being xenophobic, racist or whatever. Would you have taken it seriously if Alan Shearer had played for a few years in the Bundesliga, qualified as a German citizen and played for their national team rather than ours?
Perversely I don't mind her being 'British' as much as the ridiculousness of players from Fiji, Tonga or wherever representing England (and Wales) at rugby. Maybe I'm channeling my inner Fred Oliver and because she looks and sounds the part she can get away with it...hmmm. #pray for Fred...