Legal Heir - Income Tax Filing

I lost my mother in November 2021 and I have filed her ITR for A.Y. 2022-23 as Legal Heir. She will continue to have income from fixed deposits and bonds in the next couple of years. 

Is it permissible by law to continue filing her ITR as Legal Heir in future till her investments mature OR do I have to show income from these investments in my return OR do I have to mandatorily close all her investments and transfer the proceeds to myself as inheritance?

Any guidance will be highly appreciated!

Regards