Final answer:
Desdemona's commitment to aiding Cassio is depicted in her strong vow to perform her promised friendship to the last article, showcasing her determination to help him.
Step-by-step explanation:
To illustrate Desdemona's determination in helping Cassio be reinstated, one can reference the line from Shakespeare's Othello where Desdemona emphatically declares to Cassio: "Assure thee, if I do vow a friendship, I'll perform it to the last article." This line shows her unwavering commitment to Cassio's cause and illustrates her proactive approach in advocating on his behalf to Othello, insinuating that she will do whatever it takes to help him regain his position.