I can't link to the entry for the church book in the National Archives of Sweden right now, they seem to have some problems, but the last entry of Lovisa in Sweden seems to be in 1870 when her husband and two children emigrate in 1870.
Kolportör/colporter Jöns(?) Petter Lundqvist, b. aug 28, in either 1823 or 1828 (hard to read) in Tryserum parish
Barnmorska/midwife Lovisa Larsdotter Ståhl, b. 1833-01-03 in Edsberg parish
Son Petrus, not christened/baptised, b. 1859-11-29 in Stockholm
Daughter Hulda Maria, not christened/baprised, b. 1861-10-14 in Örebro
The four of them left Örebro Nicolai parish 1870-05-07, destination "Amerika".
Source reference; Örebro Nikolai (T) AI:26d (1866-1870) Bild 111 / sid 102 (AID: v52752.b111.s102, NAD: SE/ULA/11800)