Yes, this doubt is working for everyone. But in my opinion, Girona can definitely beat Real Madrid if they can use their strategy correctly. If Girona can beat Real Madrid at some point in this match and grab full points then it will be very easy for Girona to chase Real Madrid. And if Girona unfortunately lose this match, it will be impossible for them to chase Real Madrid.
Why it's impossible? in La Liga there are many clubs, not only Girona and Real Madrid. If Girona lose against Real Madrid, but win the rest of the matches, there's a possibility Girona can become a champion since Real Madrid will not always able to win against other clubs.
Barcelona is the example, they can become a champion in the last season when they're sometimes lose against Real Madrid.