Possible New Cracks in basement of 18 year old house
Cracks in walls mean movement due to external forces. Noises are usually from settlement of the structure (from lumber drying out and shrinking).
The narrow vertical cracks in the block wall are probably caused by foundation settlement or sol movement. Unless water is leaking through them they shouldn't be a serious problem. It would be wise to monitor them to ensure they don't increase in size.
This is probably the noise your mom hears in the still of the night. Creaks and groans are common with a house trying to get situated.
Fill the cracks with a urethane caulking. If cracks are active you will see new gaps along the caulk.