Her husband is the King of Prussia. Her son will clearly inherit it. There is no way that Parliament is going to over rule her if she wants to go to war over Hanover.
Knowing the Parliament who wanted to rid off Hanover because not worth the wars and headache, something like this would happen:
We going to accept you as queen..but your first son will not inhert britain, he can inhernt Hannover and ruled it with blackjack and hookers. your younger one can inhereret GB inteast(obvioulsy the official version will be censored