What are the prospects for my client to heal her ulcerative colitis? Is this solely a matter of removing viruses or is there a deep karmic liability that would make it reoccur?

Both of these things are true and a correct assessment and prediction. Removal of the virus can be done and has nearly been achieved by you personally working on her behalf. What is holding that back and creating a situation where there is a backsliding is her own inner turmoil and her own belief in her malady. So the situation is not yet in a state of perfection, so remaining virus is enough to replicate and restore symptoms if left unchecked, but that is a temporary circumstance. You can win the day here if you keep going. In addition, with karmic repair, total victory is a near certainty because she is otherwise in good alignment spiritually and wants this greatly, to escape this vulnerability. You are correct in seeing the impact of this on her and her whole family being not only at risk from this presumed autoimmune disorder but also in harm’s way from the COVID-19 pandemic with her immunosuppressant medication making her more vulnerable to viruses in general.