Saint Faustina wrote:"Our meals shall be such that not even the poor will have any reason to envy us" (546). So, it's no surprise that St. Faustina didn't eat meat on Fridays even outside of Lent. That was Canon Law. But since St. Faustina's time, Canon Law has allowed us, depending on our bishops conferences, to choose another penance on Fridays in place of abstaining from meat. The United States Conference of Catholic Bishops allow a substitute penance. Nevertheless, the USCCB gives "first place to abstinence from flesh meat" (24, Pastoral Statement on Penance and Abstinence)

Jesus said: Do not be absorbed in your misery — you are still too weak to speak of it — but, rather, gaze on My Heart filled with goodness, and be imbued with My sentiments. … when you feel your strength failing, if you come to the fountain of mercy to fortify your soul, you will not grow weary on your journey (Diary, 1486).

Turn to any page of St. Faustina's Diary, and you'll find spiritual gems like this one:Suddenly, I found myself in a strange cottage where an elderly man was dying amidst great torments. … When I began to pray …  The soul became calm and, filled with trust, rested in the Lord. At the same moment, I found myself again in my own room. How this happens... I do not know. (Diary of Saint Maria Faustina Kowalska, 1797)