If deceased parent had no assets, do you have to file taxes if she's eligible for $200 return from money paid taxes on pension?

She had no assets at time of death, exept for few thousand in joint account with me. Took her name off account, and gave death certificate to bank. This money divided among children. She spent all her money in nursing home. She received less than $5000 in pension and had no interest, etc. We do not care about the $200 return she would get as it would cost more to probate the will. Any info you give would be helpful. So confusing and am getting different information from other sources. thanks