Allah says: fear Allah to the best of your ability. Allah also says: Allah doesn’t burden a soul beyond what it can bear.

If she wears diapers and she tries her best to change it for every prayer and perform wudhu and pray on time, there is no sin on her at all.

If it is too difficult for her to do that, she can combine between thuhur and Asr, and between Maghreb and Isha prayers.

My mother lives all alone ,she is seventy years old (approximately), suffering from severe osteoporosis, ,blood pressure.she has no son and my father passed away long ago.she can hardly move or stand In her old age there is frequent passing of urine every now and thenbecause of inability to move and specially in winter,she cannot keep herself paak. She is afraid of azaabe qabr.is it forgiven?