Motorola Edge 50 or the Edge 50 pro would be a good option. Edge 50 is MIL-810-STD and IP68, so I would tell my mother to not worry about the phone being delicate. 5000mAh would suffice throughout the day and with 68W charger, a low battery wouldnt raise any anxiety. Camera is great with the new sony sensor on moto edg 50. No bloatware is a plus with both Pixel and Moto, but if i was you I'd go for moto edge 50 rather than the pro.