Board Thread:Questions and Answers/@comment-24593407-20140227000341/@comment-24282510-20140523214841

Kamikaze839 wrote: She had Hollow Reiatsu in her blood, so that changed her into mixed blood. Ichigo was also a mixed-blood, but he didn't die.

Having something foreign in her blood does not make her a mixed blood.

Afterall if someone has HIV, hepatitis B, hepatitis C and viral hemorrhagic fevers do they start calling themselves HIV, hepatitis B, hepatitis C and viral hemorrhagic fevers? No themselves a person with HIV, hepatitis B, hepatitis C or viral hemorrhagic fevers whenever it comes up.

The only thing the hollow did was weaken her. But then again hollow reiatsu is not a disease in the sense of HIV, hepatitis B, hepatitis C or viral hemorrhagic fevers but it still is a disease to Quincies.

So the reason Masaki died maybe like Sternritter M said. It could that the hollow reiatsu weaken her to a level that it affected her. Simplar to how 75 degrees does not affect a non sick person but to someone sick 75 degress is bone chilling cold.