Your mother seems to be suffering from multiple nutritional deficiencies as well as from Hypothyroidism
A small piece of advice to you: Please do not take any decisions by yourself regarding your mother's treatment. Go with what her treating doctor says. He will be able to assess her nutritional status and treat her accordingly.
As of now, I feel that she should still continue with the injections.
You need to work in close relation with her treating doctor and also probably take advice of an expert nutritionist.
Hope this helps you.