About 7 weeks ago my sister had a c-section and she is still bleeding to the point that she soaked through her pants and onto a chair today. This doesn't seem normal to me... is it?

No. Why hasn't she called her Physician?

This could be serious and she could be losing a lot of blood - although it usually looks worse than it is.

She needs to see her doctor ASAP, this is not normal and can be life threatening.