Hi Alina, I am going through the same difficulty with my grandmother, however she hasn't undergone any treatment. She is a lot older than your Mum, she experiences fatigue doesn't want to continue doing the things she did (e.g. reading, crochet, her odd jobs around the house, writing letters etc.). She also stays in bed a lot more than she has in the past month, despite being almost 92 she was always up at 6am and would be busy until the evening when she went to bed.
It sounds like you are doing all that you can, you are talking to her and supporting her, but I empathise that with not knowing what to say or how to cope with these states. It would be so hard and heartbreaking to see your Mum, a strong woman, loosing her enthusiasm and energy.
As Emily said above your Mum may need to adjust and cope with everything the best/only way she knows how. I know how hard it is to see her so tired and lacking interest, I am also wondering what it is like for you? How do you feel about it and cope? I ask these questions because I know that I am struggling and not coping as well, which makes me feel frustrated and worried.
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