Let her resign from the House and be nominated.
And then let her nomination go nowhere in the Senate.
Of course the pantywaist new Majority Leader McConnell would schedule a vote and his pantywaist minions would probably vote for her.
If she is appointed ambassador after the election California will have to hold a special election to replace her.
Just what broker than broke California needs is to waste another couple million dollars in San Fran Sicko to elect another ultra-socialist.