Since her
B12 level was 276 pg/mL, which is on the lower side of the normal range, completing the 2-month course is a good step. However, the appropriate maintenance dose depends on her current B12 level, dietary intake, symptoms, and the reason for the low level. I would recommend repeating her
Vitamin B12 test now/around 2–3 months before starting supplementation. Based on the updated level, a maintenance dose can be decided.
If her levels have improved adequately, a lower maintenance dose may be sufficient, along with regular dietary sources of B12 such as milk/curd, eggs, fish, chicken or other fortified foods, depending on her diet. If she remains low or has an underlying absorption issue, longer-term supplementation may be required. Please avoid continuing a high-dose supplement indefinitely without reviewing her updated blood report.
Next Steps
Repeat
Vitamin B12, and share the report. Then only i can guide you.