One of the founding members of the Finnish Salvation Army, she became aware of the effects of poverty and unsanitary conditions for new mothers.

She established the first maternity home in Porvoo, published materials to educate women on childbirth and sanitation, and provided counseling for new mothers.

The group left in April 1889 to travel to England and study to become rescue officers and returned after a six-month training period.

[2] On 17 April 1895, Forsius had graduated as a midwife from the Helsinki Obstetrics Hospital and began working throughout the countryside surrounding Porvoo.

On 10 September 1898 she graduated from a technical course on the use of equipment to facilitate births and decided to open a private maternity clinic in Porvoo which offered safe and hygienic conditions for expectant mothers.

Each mother who left the facility received information on formula for increasing baby-birth weights and sterilized bottles.

[11] She purchased a lot and built a large building which had four bedrooms, a parlor, a children's playroom, a dining room, office, kitchen and three balconies.

[12][2] Mothers were charged a small fee, but most could not pay and were taught to make handicrafts and sell them to cover the costs.

It was reprinted in 1900 and 1901 with variations in the title,[13] and was a detailed and practical guide giving information on abortion, breast care, childbirth, exercise, illness, miscarriage, nutrition, and sanitation.

"Solhemi", the home she established for unwed mothers, was turned into a kindergarten in 1957 and is one of the three surviving farms which had been operated by the Salvation Army in the country.