I think you need to take a step back, and allow your Mum to make her own decision. I understand your concern, that is natural, but your Mum cannot be kept wrapped in cotton wool, and if the safety precautions are thorough, and I'm certain they will be, then the good of being able to get out and be amongst others will far outweigh endless days of being shut in and seeing hardly anyone.
Here's a poem sent to me , written by a lady called Iris Hesselden, that I think is relevant to the situation we are all in at the moment:
keep Stepping
Sometimes we need to take a step
That's very hard to do.
But going forward steadily
One step turns into two.
And sometimes when we look ahead
The future's looking bleak,
But going forward steadily,
We find the path we seek.
So take a step, a little step,
And tiptoe if you must,
But never look too far ahead
And learn to hope and trust.
Leave yesterday behind you now,
This day has all you need.
So keep on stepping steadily
And know you will succeed
Iris Hesselden.