With the LLord being in residence and there being no Exclusivity of Tenure, she can only be a NDep or a Lodger.
As her liability was originally waived for the provision of care, what changed? If nothing and she is still providing care, then does she really have a liability as there does not appear to have been one in the first instance. – (her rent was absolved as payment for services provided)
But on the flip side, she must have made some contribution to the household because her and her two children must have had a large impact on electricity/heating/food etc
