Can estrogen hormone therapy cure chronic bladder infections?

my mother has been sick for over a year and actually ended up in the hospital for a week close to death, because her infection got into her blood. She has had one bladder infection after another, and her doctor just keeps prescribing her antibiotics. They also put her on a medication to make her urine more acidic to kill off bacteria, but nothing is helping. It is scaring me that she is saying that she is afraid she is going to die. Before this problem she had surgery to tie her bladder up because it was slouching, but she had an internal exam with a mini camera, and besides a slightly wrinkled bladder wall, the urologist could find nothing wrong. At the same time she had a hysterectomy which threw her into menopause. I read that estrogen levels being thrown off by menopause can cause chronic bladder infections. Has anyone been given estrogen to fix a problem like this and does it work? We are very worried about her and desperate for an answer.