Squawvine has a few different name one being partridge berry vine.

According to a study aty the NIH.gov

Mitchella repens contains resin, wax, dextrin, saponins, alkaloids, glycosides, and tannins . Mitchella repens herb was already used by Indians in North America to prevent miscarriage, pregnancy complications, and to reduce pain in labor .Mitchella repens herb has sedative [23] and diuretic [29] effects. Extracts of Mitchella repens herb are typically used in the puerperium to alleviate nipple swelling and pain, and in the burn of the breasts [23,29]. It was stated in [23] that there are no literature reports about safety of use of Mitchella repens herb in pregnant women and during lactation.