Estrace Vaginal Cream - Is Estrace cream used fro yeast infection?

No, Estrace Vaginal cream isn't used for yeast infections.

Estrace (estradiol) is a form of estrogen, a female sex hormone the regulates many processes in the body.

Estradiol vaginal (local) is used to treat certain symptoms of menopause such as dryness, burning, and itching of the vaginal area. Estradiol vaginal also reduces urgency or irritation of urination.

http://www.drugs.com/mtm/estrace-vaginal-cream-local.html

For vaginal infections you should use an antifungal cream such as miconazole cream, clotrimazole cream, etc.