Depression. Is this normal?

I understand your concern towards your mother in law. She seems to be suffering from few depressive symptoms however the reason is unclear from whatever you have mentioned. Information regarding her sleep, hunger, concentration and energy levels would be helpful to decide on the severity of her condition. However it is easily manageable with appropriate treatment. Some counselling sessions and if needed medical help also might be useful for her. My clinic is at OMR chennai. I speak tamil as well. I would also be more than happy to help you with that if you are looking for online assistance. Discussions will be held confidential. You can directly consult with me through Practo as needed. Online chat consultation is also available.