For some reason, the link to digihakemisto doesn't work for me.
I opened the desired entry here: http://digi.narc.fi/digi/view.ka?kuid=8136455
Two diseases are listed as the cause of death of Maria - tubercle and heart disease. Unfortunately, it is not clear from the metric record which disease was predominant. It is possible that Maria had both of these diseases and the doctors were unable to make an accurate diagnosis.