I suspect that even the mighty Sqad might require more information before being able to give a meaningful reply here.
The NHS website states that bowel cancer (which includes cancer of the colon) can usually be fully cured by surgery if it hasn't spread beyond the bowel when first diagnosed. (
https://www.nhs.uk/conditions/bowel-cancer/#treatment-for-bowel-cancer ). However it's not clear from your post as to whether that cancer has already spread to her blood cells or whether she's just unfortunate enough to have two entirely separate cancers at the same time.
Further, there's no single disease called 'blood cancer'. See here for a summary of the various conditions which come under that general description:
https://www.royalmarsden.nhs.uk/your-care/cancer-types/blood-cancers
(Once again, as with all cancers, the chances of a complete cure depend heavily upon how early the disease is detected).