Answer: She will need 1.375 kg of proteins during 25 days of training.
Step-by-step explanation:
Since we have given that
Amount of protein per day eaten by an athlete = 55 g
Number of days of training = 25 days
So, Amount of protein for 25 days is given by

As we know that
1 kg = 1000 grams
1 gram = 
1375 grams = 
Hence, She will need 1.375 kg of proteins during 25 days of training.