Julie's issue was that she had a cyst, which had been around since her 3 1/2 years doing Eliza in MY FAIR LADY. What saved her voice for so long was her ability to allow it the proper rest. Her stint in CAMELOT put no real strain on her cords, because the show was so easy for her to sing. MFL is a far more demanding show, vocally. In fact, no other Eliza comes close to performing the role as many times as Julie, because it is so vocally demanding (singing in chest, head and screaming, etc.) Then she did films, and only an occasional concert, so her cords got lots of rest. When she did VICTOR/VICTORIA, she was on the road for an entire year, prior to its Broadway opening, so that by the time the show opened on Broadway, her cyst was causing vocal problems. She went another year and a half, singing with a voice that should have had rest. She was scheduled to take V/V to Houston, and a doctor advised her that she could have surgery and repair her voice. Of course, the surgery was botched and her voice was destroyed. She sued and won millions. Bottom-line; give your cords, lots of rest!
And enjoy the beauty - all the joy and beauty - that a Merry Christmas can bring to you!