The sentences seem very natural to me. I'm not sure that I've previously come across the collocation "a very lucky destiny," but it works for me. I'm curious about the mouse-operated bedroom light.
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beoproLast night while she was replacing a new mouse for her bedroom lightYes I too am bemused by "a mouse for her bedroom light". Also you would not replace a new mouse unless it were faulty. You would replace the old one with the new one, we would say "replacing" and it is taken as read.
LouiseTyou would not replace a new mouseGood point. How did I miss that?